POPULAR WORKS ON SCIENCE BY SIR RAY LANKESTER, K.C.B., F.R.S. Published by METHUEN & Co. LTD. SCIENCE FROM AN EASY CHAIR. First Series. 60. DIVERSIONS OF A NATURALIST. 6s. Published by CONSTABLE & Co. FROM AN EASY CHAIR, is. EXTINCT ANIMALS. 2s. 6d. Published by the RATIONALIST PRBSS ASSOCIATION THE KINGDOM OF MAN. 6d. SCIENCE FROM AN EASY CHAIR A SECOND SERIES BY SIR RAY LANKESTER K.C.B., F.R.S. WITH FIFTY-FIVE ILUSTRATIOXS SECOND EDITION METHUEN & CO. LTD. 36 ESSEX STREET W.C. LONDON Q Originally published by Messrs. Adlard & Son in 1913 First published by Methuen £• Co., Ltd. . . 1914 Second Edition I9f5 PREFACE I AM encouraged by the kind reception given to the first selection of papers from my weekly contributions to the 'Daily Telegraph' to publish a second series of 'Science from an Easy Chair/ of like form and size. I have given in this, as in the earlier volume, some figures in illustration of the articles, and have, here and there, revised and expanded the originals. It must be remembered that these papers are, strictly speaking, " occasional." There is no attempt to treat any subject in a complete or detailed way. The chapters are purposely arranged so as to pro- duce a variegated result — a mixed assortment in which it is hoped that readers of differing interests may find each something to his taste. I hope that some may be led by the reading of one of my short chapters to look further into the matter of which it treats and to consult more thorough-going treatises abounding in details and pictures which are beyond the scope of this little volume. The two volumes bearing the title, ' Science from an Easy Chair,' viz. the present one (second series) and that published in 1910 by Methuen & Co., contain only vi SCIENCE FROM AN EASY CHAIR a small portion of the articles published in the ' Daily Telegraph,' one every week, since October, 1907. It is my intention to collect the rest of this material in book form as soon as I can find time to do so. E. RAY LANKESTEJL October, 1912. CONTENTS I. A DAY IN THE OBERLAND Fertilisation of Sage — The Edelweiss — The Jungfrau's Breast — Contortions of Rock-strata — The Jungfrau Railway — Mountain Sickness. II. SWITZERLAND IN EARLY SUMMER . Alpine Flowers — Flowers of the Meadows and Woods —The Herb Paris. III. GLETSCH ... From Baveno to the Rhone Glacier — A Glacier by the Roadside— Changes in the Glacier. IV. GLACIERS Snow squeezed to Ice — Regelation — Movement of Glaciers — Vast Size of Ancient Glaciers — Distinct Glacial Periods — Causes of Glacial Periods — Date of Last Glacial Extension — The Flow of Glaciers — The Colour of Ice — Ice Scratching and Ice Polishing — Excavation by Glaciers. V. THE PROBLEM OF THE GALLOPING HORSE . The Cinematograph — Ancient Representations of Gallop — The Dog in Mycenaean Art — What ought an Artist to do? — Attention as a Condition of Seeing — Judg- ment and Prejudice — Natural and Artificial Paces — Photographs by Electric Spark — Use of Instantaneous Photographs — Errors as to the Size of the Moon — The Painter and the Moon — The Moon on the Stage. VI. THE JEWEL IN THE TOAD'S HEAD .... The Decay of Credulity— A Sceptical Physician — How to Test a Toadstone — Other Magical Stones — Medi- cinal and Magical Stones. VII. FERN-SEED . Invisible Seed— The Spores of Ferns— The Prothallus of Ferns — Fertilisation of Figs and Palms. 22 52 85 96 viii SCIENCE FROM AN EASY CHAIR CHAITER PACK VIII. FERNS THE ANCESTORS OF FLOWERS . . .107 Chemical Attraction — Transition from Ferns to Flowers — The Gingko Tree and Cycads — Extinct Seed-pro- ducing Ferns. IX. ELEPHANTS 119 The Indian and the African Elephant — Size of Modern Elephants — Ears and Teeth of Elephants — Earliest Elephants brought to Europe — The Elephant's Legs — Tusks used in Digging — Elephants used in War — Geological Strata since the Chalk — Ancestral Mam- mals—The Typical or Ancestral Set of Teeth— The Peculiarities of the Teeth of Elephants — Extinct Relatives of Elephants — Ancestors of Elephants — Origin of the Elephant's Trunk. X. A STRANGE EXTINCT BEAST 148 Fossil Skeletons and Jaw-bones — The Skull and Teeth of Goats— The Teeth of Rats — The Rat-toothed Goat — Origin of the Rat-toothed Goat. XI. VEGETARIANS AND THEIR TEETH . . . .159 Teeth of Carnivors — Mixed Diets — Disease-germs in Food. XII. FOOD AND COOKERY 170 Special Diet of Various Races — Food and Habit — Nervous Control of Digestion — Wholesale Food and Mechanical Cookery — The Burnt Offering of the Jews — Women Neglect Cookery — A Great German's Appreciation. XIII. SMELLS AND PERFUMES . . . •. . .184 Smells and Memory — Accidental Qualities — Bacteria and Smells — Some Remarkable Smells. XIV. KISSES 193 Kissing and Smelling — Variations in the Sense of Smell — Radiation and Odours — Attraction by Smell — Unconscious Guidance by Smell. XV. LAUGHTER 204 Why do we Laugh ? — Varieties of Laughter — The Laugh of Escape from Death — The Laugh of Derision. XVI. FATHERLESS FROGS 213 Fertilisation of the Egg-cell — Egg-cells Developing Un- fertilised— M. Bataillon's Discovery. CONTENTS ix CHATTER PACK XVII. PRIMITIVE BELIEFS ABOUT FATHERLESS PROGENY 221 Harvey and Milton — Reproduction by Budding — Stories of Virgin Births — Spiritual Theory of Conception. XVIII. THE PYGMY RACES OF MEN . . . . 230 Characteristics of Pygmies — Colour of the Skin- Egyptian Stories of Pygmies — Congo and New Guinea Pygmies — The Causes of Small Size — Small- ness a Correlation. XIX. PREHISTORIC PETTICOATS 244 Early Carvings and Pictures — Paintings in Caverns — Painting of Human Figures — Artistic Sympathy — Aurignacians and Bushmen Allied. XX. NEW YEAR'S DAY AND THE CALENDAR . . .256 Make-believe and New Year — Divisions of Time — The Difficulties of the Calendar— Pope Gregory's Ten Days — The Astronomer Royal and the Shah. XXI. EASTERTIDE, SHAMROCKS AND SPERMACETI . . 267 The Real Shamrock — Sham Shamrock — Leonardo or Lucas ? — Various Fats. XXII. THE STRANGE HISTORY OF THE TADPOLES OF THE SEA 276 Sea-squirts — The Anatomy of a Sea-squirt — The Sea- squirt's Coat — The Sea-squirt's Young — Gill-slits — Structure of the Sea-squirt's Tadpole — Fixation of the Sea-squirt's Tadpole — The Frog's Tadpole — Simplification with Specialisation — Mites as Deca- dent Spiders — Composite Sea-squirts — Phosphores- cent Colonies — The Organs of Phosphorescence — Solitary Salps and Chain-salps — Tell-tale Young Stages — The Peacock's Train — Simplification ot Train-feathers. XXIII. MUSEUMS 310 The Muses — The Museum of Alexandria — Picture Gal- leries and Museums — The Purposes of Museums — The First Business of Museums — National Value of Museums — University Museums — Not for Children but for Adults — Screens and Electric Lifts — Frames and Setting of Pictures. XXIV. THE SECRET OF A TERRIBLE DISEASE . . . 330 The Angel of Death — The Tyranny of Parasites — Typhus and Monkeys — Typhus Fever in Russia. x SCIENCE FROM AN EASY CHAIR CHAPTER ' .ft XXV. CARRIERS OF DISEASE .... . 339 The Entrance of Parasites — Man as a Carrier of Disease — House Flies and Disease. XXVI. IMMUNITY AND CURATIVE INOCULATIONS . . 346 Inoculation of Smallpox — Antitoxins — The Wonderful Properties of Blood — Germ-killing Poisons in the Blood — Opsonins or Sauce for Germs. XXVII. THE STRANGE STORY OF ANIMAL LIFE IN NEW ZEALAND 357 Strange Birds — Destroyed by Europeans — Introduced Animals. XXVIII. THE EFFACEMENT OF NATURE BY MAN . . 365 Disappearance of Great Animals — Man's Reckless Greed — Hope in Irrigation. XXIX. THE EXTINCTION OF THE BISON AND OF WHALES 373 Drowning in a Dead Whale's Heart — The Value of Whalebone — No more Turtle Soup. XXX. MORE ABOUT WHALES 380 The Shape of Whales — Enormous Pressure of Gas in the Blood— The Killer and the Narwhal— Fossil Whales. XXXI. MISCONCEPTIONS ABOUT SCIENCE . . . .388 What Science does not explain — Darwin's Theory is adequate — The Aquosity of Water — Need for Inter- preters of Science — The Exploded Ghost called "Caloric" — Nightmares Destroyed by Science — When did the Soul arrive ? — The Great Silence. INDEX 405 LIST OF ILLUSTRATIONS FIGURES IN THE TEXT IG. PACK 1. FLOWER OF THE YELLOW SAGE 4 2. THE EDELWEISS 6 3. "FOLDING" OF ROCK STRATA 8 4. A MAN EXTRACTING THE JEWEL FROM A TOAD'S HEAD 89 5. THE PALATE OF THE FOSSIL FISH LEPIDOTUS. . . 91 6. UNDER-SURFACE OF THE FROND OF THE COMMON POLYPODY FERN 96 7. GERMINATION OF THE SPORE OF A FERN . . . 100 8. UNDERSIDE OF THE PROTHALLUS OF A FERN . . . 101 9. THE SPERM-SACS AND EGG-PITS OF THE PROTHALLUS OF THE FERNS 105 10. THE RELATION OF THE SPORE-PRODUCING LEAVES OR LEAFLETS OF A ROYAL FERN, A PINE TREE, AND AN ORDINARY FLOWER . . . ... . . .in 11. THE INDIAN ELEPHANT 120 12. THE AFRICAN ELEPHANT 121 13. THE CROWNS OF THREE "GRINDERS" OR MOLARS OF ELEPHANTS COMPARED 126 14. SKELETON OF THE INDIAN ELEPHANT . . . .137 15. THE TEETH IN THE UPPER AND LOWER JAW-BONE OF THE COMMON PIG 140 16. A RECONSTRUCTION OF THE EXTINCT AMERICAN MAS- TODON 142 17. SKULL AND RESTORED OUTLINE OF THE HEAD OF THE LONG-JAWED EXTINCT ELEPHANT CALLED TETRA- BKLODON . 143 zi xii SCIENCE FROM AN EASY CHAIR FIG. VAQE 1 8. HEAD OF THE ANCESTRAL ELEPHANT— PAL/EOMASTODON 145 19. RESTORED MODEL OF THE SKULL AND LOWER JAW OF THE ANCESTRAL ELEPHANT — PAL^OMASTODON . .146 20. HEAD OF THE EARLY ANCESTOR OF ELEPHANTS— MERI- THERIUM— AS IT APPEARED IN LIFE . . . .147 21. SKULL AND LOWER JAW OF A GOAT 150 22. TEETH IN THE LOWER AND UPPER JAW OF THE GOAT 151 23. SKULL OF A TYPICAL "RODENT" MAMMAL, THE COYPU RAT 152 24. TEETH OF THE COYPU RAT 153 25. SKULL OF THE RAT-TOOTHED GOAT, MYOTRAGUS . .155 26. SKULL OF A CLOUDED TIGER 160 27. TEETH OF THE LOWER AND UPPER JAW OF THE SAME CLOUDED TIGER'S SKULL 161 28. FIGURE FROM A GROUP DRAWN ON A GREEK VASE . 235 29. GROUP OF WOMEN CLOTHED IN JACKET AND SKIRT WITH "WASP-LIKE" WAISTS 250 30. FURTHER PORTION OF SAME GROUP AS FIG. 29 . .251 31. Two KINDS OF ASCIDIANS OR "SEA-SQUIRTS" „ . 277 32. A DISSECTION OF AN ASCIDIA , 278 33. BRILLIANTLY COLOURED STAR-LIKE GROWTHS . .281 34. TADPOLE OF A FROG AND OF AN ASCIDIAN . . . 283 35. ANATOMY OF THE TADPOLES OF THE FROG AND OF THE ASCIDIAN 285 36. HEAD OF AN ASCIDIAN TADPOLE 287 37. FIXATION OF THE ASCIDIAN TADPOLE BY ITS HEAD TO A ROCK 288 38. Do., A LATER STAGE 289 39. THE DEVELOPMENT OF THE FROG'S TADPOLE INTO A YOUNG FROG 291 40. Two INDIVIDUALS OF THE SHIP'S BARNACLE . . . 294 41. DEVELOPMENT OF THE BARNACLE FROM A FREE-SWIM- MING STAGE WITH Six ACTIVE LEGS . . . .295 LIST OF ILLUSTRATIONS xiii PLATES THE JUNGFRAU SEEN FROM ABOVE THE LAUTER- BRUNNEN VALLEY Frontispiece I. CONSECUTIVE POSES OF THE GALLOPING HORSE Facing p. 54 II. VARIOUS REPRESENTATIONS OF THE GALLOP . „ 56 III. REPRESENTATIONS OF THE GALLOP „ 58 IV. REPRODUCTION FROM MR. THEODORE A. COOK'S BOOK, 'A HISTORY OF THE ENGLISH TURF' „ 64 V. THE TRACK OF THE RISING MOON „ 76 VI. THREE FIGURES— LORD LANSDOWNE, MR. LLOYD GEORGE, AND MR. ASQUITH „ 83 VII. TEETH OF THE UPPER AND LOWER JAW OF MAN ...... Between pp. 166 and 167 VIII. TEETH OF THE UPPER AND LOWER JAW OF THE GIBBON .... Between pp. 166 and 167 IX. FIRST LOWER MOLARS OF ORANG-OUTAN AND MAN Facingp. 169 X. VOTARY OR PRIESTESS OF THE GODDESS TO WHOM SNAKES WERE SACRED M 253 XI. FRESCO DRAWING OF Two FEMALE ACROBATS „ 252 XII. THE EYED FEATHERS OF THE PEACOCK'S TAIL „ 307 XIII« SCIENCE FROM AN EASY CHAIR SECOND SERIES • CHAPTER I A DAY IN THE OBERLAND V I AM writing in early September from Interlaken, one of the loveliest spots in Europe when blessed with a full blaze of sunlight and only a few high-floating clouds, but absolutely detestable in dull, rainy weather, losing its beauty as the fairy scenes of a theatre do when viewed by dreary daylight. It is the case of the little girl of whom it is recorded that " When she was good she was very good, and when she was not she was horrid." This morning, after four days' misconduct, Interlaken was very good. The tremendous sun-blaze seemed to fill the valleys with a pale blue luminous vapour, cut sharply by the shadows of steep hill-sides. Here and there the smoke of some burning weeds showed up as brightest blue. Far away through the gap formed in the long range of nearer mountains, where the Liitschine Valley opens into the vale of Interlaken, the Jungfrau appeared in full majesty, absolutely brilliant and unearthly. So I walked towards her up the valley. Zweiliitschinen is the name given to the spot where the valley divides into two, I 2 A DAY IN THE OBERLAND that to the left leading up to Grindelwald, under the shadow of the Monch and the Wetterhorn, that to the right bringing one to Lauterbriinnen and the Staubbach waterfall, with the snow-fields of the Tchingel finally closing the way — over which I climbed years ago to Ried in the Loetschen Thai. The autumn crocus was already up in many of the closely trimmed little meadows, whilst the sweet scent of the late hay-crop spread from the newly cut herbage of others. At Zweilutschinen, where the white glacier-torrent unites with the black, and the milky stream is nearly as cold as ice, and is boiling along over huge rocks, its banks bordered with pine forest, I came upon a native fishing for trout. He was using a short rod and a weighted line with a small " grub " as bait. He dropped his line into the water close to the steep bank, where some projecting rock or half-sunk boulder staved off the violence of the stream. He had already caught half-a- dozen beautiful, red-spotted fish, which he carried in a wooden tank full of water, with a close-fitting lid to prevent their jumping out. I saw him take a seventh. The largest must have weighed nearly two pounds. It seems almost incredible that fish should inhabit water so cold, so opaque, and so torrential, and should find there any kind of nourishment. They make their way up by keeping close to the bank, and are able, even in that milky current, to perceive and snatch the unfortunate worm or grub which has been washed into the flood and is being hurried along at headlong speed. Only the trout has the courage, strength, and love of nearly freezing water necessary for such a life — no other fish ventures into such conditions. Trout are actually caught in some mountain pools at a height of 8000 ft., edg^d by perpetual snow. FERTILISATION OF SAGE 3 You are rarely given trout to eat here in the hotels. A lake fish, called " ferras," a large species of the salmonid genus Coregonus, to which the skelly, powan, and vendayce of British lakes belong, is the commonest fish of the table d'hote, and not very good. A better one is the perch-pike or zander. It is common in all the larger shallow lakes of Central Europe, and abounds in the " broads " which extend from Potsdam to Hamburg, though it is unknown in the British Isles. It is quite the best of the European fresh-water fish for the table, and there should be no difficulty about introducing it into the Norfolk Broads. It would be worth an effort on the part of the Board of Agriculture and Fisheries to do so, as the perch-pike, unlike other fresh-water fishes, would hold its own on the market against haddock, brill, and plaice. Another interesting fresh-water fish which grows to a large size in the Lake of Geneva (where I have seen it netted) is the burbot — called " lote " in French — a true cod of fresh-water habit which, though common through- out Europe and Northern Asia, is, in our country, only taken in a few rivers opening on the east coast. It is a brilliantly coloured fish, orange-brown, mottled with black, and is very good eating. Passing up the Lauterbriinnen valley, I came upon some wild raspberries and quantities of the fine, large-flowered sage, Salvia glutinosa> with its yellow flowers, in shape like those of the dead-nettle, but much bigger, They were being visited by humble-bees, and I was able to see the effective mechanism at work by which the bee's body is dusted with the pollen of the flower. I have illustrated this in some drawings (Fig. i) which are accompanied by a detailed explanation. Two long stamens, a1, arch high up over the lip of the flower, //, on which the bee alights, and are protected by a keel or hood of the corolla. Each stamen is provided with a broad process, a2, standing 4 A DAY IN THE OBERLAND out low down on its arched stalk, and blocking the way to the nectar in the cup of the flower. When the bee pushes his head against these obstacles and forces them backwards, the result is to swing the long arched stalk, FIG. i. — Diagrams of the flower of the yellow sage (Salvia glutinosa) a little larger than life. I. An entire flower seen from the side. st. The stigma, a2. The pair of modified half-anthers which are pushed back by the bee when inserting its head into the narrow part of the flower. 2. A similar flower at a later stage when the stigma, st., has grown downwards so as to touch the back of a bee alighting on the lip of the flower, and gather pollen from it. 3. Diagram of one of the two stamens. /. The stalk or filament of the stamen. a1. The pollen-producing half-anther. co. The elongated connective joining it to the sterile half-anther. 4. Sec- tion through a flower showing ov. the ovary ; nee. the nectary or honey-glands ; st. the style ; li. the lip of the flower on which the bee alights. 5. Similar section showing the effect of the pushing back of a2 by the bee, and the downward swinging of the pollini- ferous half-anther so as to dust the bee's back with pollen. The dotted arrow shows the direction of the push given by the bee. THE EDELWEISS 5 with its pollen sacks, in the opposite direction, namely, forwards and downwards on to the bee's back. It was easy to see this movement going on, and the consequent dusting of the bee's back with pollen. In somewhat older flowers, which have been relieved of their pollen, the style, St., or free stalk-like extremity of the egg-holding capsule, already as long as the stamens, grows longer and bends down towards the lip or landing-place of the yellow flower. When a pollen-dusted bee alights on one of these maturer flowers the sticky end of the now depending style is gently rubbed by the bee's back and smeared with a few pollen- grains brought by the bee from a distant flower. These rapidly expand into " pollen tubes," or filaments, and, penetrating the long style, reach the egg-germs below. Thus cross-fertilisation is brought about by the bees which come for the nectar of Salvia. The stalks and outer parts of the flower of this plant produce a very sticky secretion which effectually prevents any small insects from crawling up and helping themselves to the nectar exclusively provided for the attraction of the humble-bee, whose services are indispensable. As I walked on a belated Apollo butterfly, with its two red spots, and a pale Swallow-tail fluttered by me. Then some children emerged from unsuspected lurking-places in the wood and offered bunches of edelweiss (Fig. 2). This curious-looking little plant does not grow (as pretended by reporters of mountaineering disasters) exclusively in places only to be reached by a dangerous climb. I have gathered it in meadows on the hillside above Zermatt, and it is common enough in accessible spots. The flowers are like those of our English groundsel and yellow in colour — little " composite " knobs, each built up of many tubular " florets " packed side by side. Six or seven of these little short-stalked knobs of florets are arranged in a circlet around a somewhat larger central knob, and each of them 6 A DAY IN THE OBERLAND gives off from its stalk one long and two shorter white, hairy, leaf-like growths, flat and blade-like in shape and spreading outwards from the circle, so that the whole series resemble the rays of a star (or more truly of a star- FIG. 2. — The Edelweiss, Gnaphalium leontopodium. fish !). They look strangely artificial, as though cut out of new white flannel (with a greenish tint), and have been dignified by the comparison of the shape of the white- flannel rays with that of the foot of the lion and the claws of the eagle. They are extraordinary-looking little plants, and are similar in their hairiness and pale tint to THE JUNGFRAU'S BREAST some of the seaside plants on our own coast, which, in fact, include species closely allied to them (" cud-weeds " of the genus Gnaphaliuiri). The huge cliffs of rocks on either side (in some parts over a thousand feet in sheer height from the torrent) come closer to one another in the part where we now are than in most Alpine valleys, so as almost to give it the character of a " gorge." At some points the highest part of the precipice actually overhangs the perpendicular face by many feet. A refreshing cold air comes up from the icy torrent, whilst the heat of the sun diffuses the delicious resinous scent of the pine trees. Above the naked rock we see steep hill-sides covered with forest, and away above these again bare grass-slopes topped by cloud. But as the clouds slowly lift and break we become suddenly aware of something impending far above and beyond all this, something more dazzling in its white brightness than the sun-lit clouds, a form sharply cut in outline and firm, yet rounded by a shadow of an exquisite purple tint which no cloud can assume. The steely blue Alpine sky fits around this marvel of pure whiteness as it towers through the opening cloud, and soars out of earth's range. What is this glory so remote yet impending over us ? It is the Jungfrau, the incomparable virgin of the ice-world, who bares her snowy breast. She slowly parts her filmy veil, and, as we gaze, uncovers all her loveliness. The rock walls of the Lauterbriinnen valley show at one place a thickness of many hundred feet of strongly marked, perfectly horizontal "strata" — the layers deposited immense ages ago at the bottom of a deep sea. Not only have they been raised to this position, and then cut into, so as to make the profound furrow or valley in the sides of which we see them, but they have been bent and contorted in places to an extent which is, at first sight, 8 A DAY IN THE OBERLAND nfrt "8 « ^i 11*1 *•* 3* ^x * 1 •5 -^ | « V M- *S S « 0 H -S o \ * §•3 8-8 2 g £ *« S §*§ S3 cu'C 2 >, \ o re 1 3 "^ u « « « S / O J3 .^ •=r &! 0 ^-il 11i.r fl»J . (n O •«-» < «•§ S k js"s ! 2 §!s "•° If 2 jf & s S3 5 13 73 'S JSs ~-d •^ C 4) .) thus arrives at one of the volcano-like egg-pits, it plunges into its opening and fuses with the contained egg cell, thus fer- tilising it (Fig. 9, D). It is then, and not until then, that the egg cell commences to grow and divide, and gives rise to the young fern plant (Fig. 8, B, b). The fern plant nourishes itself and develops rapidly, whilst the little green prothallus, having borne its crop of eggs and sperms, withers, and is seen no more. The fern plant, on attaining full size and maturity, produces, as did its grandparent, FIG. 9. — The sperm-sacs and egg-pits of the prothallus of the ferns highly magnified. A'. Surface view of a ripe open sperm-sac. A. Section through it, showing the flattened cells forming its walls and the contained corkscrew-like " sperms." B. The minute wriggling sperms (Sp.) escaping from the sperm-sac into the water adhering to the surface of the prothallus. c. A single sperm still more magnified. D'. Surface view of an open egg-pit. D. Section through an unfertilised egg-pit. Sp, A sperm swimming towards the open mouth of the egg-pit. Con. Cells forming conducting- plug along which the sperm will travel. Ov. Ovule or egg-cell. E. Fertilised egg-pit. In. The orifice. Ov. The ovule now ferti- lised and enlarging. 106 FERN-SEED spore cases on the back of its leaves, which in due time shed their minute unicellular spores, and these falling on the moist earth grow, without any " fertilisation " by pollen or sperm, into marchantia-like prothalli. Thus there are two distinct generations in the life-history of the fern. The first is the large foliaceous plant with stem and leaves, which we call a fern. It produces spores of only one kind ; they are self-sufficient, and germinate without any fusion with, or fertilisation by, sperm or pollen. This generation — the fern plant — we call " the spore-bearer," or sexless generation. The second generation is the little flat prothallus which arises from the spores of the spore-bearer. It — and this is the remarkable thing which so long escaped the observation of botanists — produces male and female reproductive organs — the sperm-sacs and the egg-pits. It, small and obscure though it be, is a complete organism in itself, producing " eggs " or " germ-cells " which are duly fertilised by sperm threads. We call it, in contrast to the first generation, " the egg-and-sperm bearer," or the sexual generation. Each of its fertilised eggs gives rise by growth and development to a spore-bearer or fern. Thus, then, there is an alternation of the two generations, the spore-bearing big fern and the egg-and-sperm-bearing marchantia-like prothallus. After all, our ancestors were right in thinking that something very queer and unusual underlay the propagation of ferns ! Not the least note- worthy fact in the matter is that the male fertilising element of the sexual generation of the fern is not dry, dusty " pollen " as in flowering plants, but microscopic aquatic " spermatozoa " like those of animals. Thereby hangs a tale of extraordinary interest as to the nature and origin of flowering plants to which I will give a new chapter. CHAPTER VIII FERNS THE ANCESTORS OF FLOWERS WE have seen that the spores of ferns falling on the ground produce little flat green patches — the "pro- thalli " — upon which female egg-pits and male sperm-sacs in due course make their appearance, and that the microscopic screw-like sperms (or " antherozoids " as the botanists call them) escape from the sacs and actively swim to the egg- pits through the film of water covering the damp growth. They enter the egg-pits and " fertilise " the contained egg-cell. All plants simpler than ferns, such as horse- tails, mosses, seaweeds, and water-weeds (with some excep- tions) have actively motile aquatic " sperms " like those of the ferYi. And so, be it noted, have animals. All plants higher and more elaborate than the ferns — such as the conifers and flower-bearing trees, shrubs, and herbs (with the rare exception among living plants of the Gingko tree and the Cycads), cease to produce aquatic motile sperms. Their male spores are the familiar dust-like dry " pollen " from which, when it falls on the sticky stigma of the flower — a solid filament grows and penetrates to the egg-cells buried in the germen, or egg-holding central part of the flower. Thus, ferns seem to represent a stage half-way between the lower plants and the higher. And as a matter of fact, in regard to many points of their structure, they do. Recent discoveries of fossil fern-like plants of great age have led to the definite conclusion that lo8 FERNS THE ANCESTORS OF FLOWERS from ancient ferns the whole galaxy of modern cone- and flower-bearing higher plants have been derived by a slow process of change, step by step. Before we look further at this interesting history, let me tell of a very remarkable discovery about the active little swimming sperms of the fern's sexual generation. More than thirty years ago, one of the ablest of living botanists — Pfeffer by name — was watching with his microscope the movements of the swimming fern "sperms" (see Fig. 9, B, c) in the presence of one of the tiny egg-pits which he had cut off from a " prothallus," and placed in a thin film of water covered by thin glass, under a high magnifying power. He saw that as the sperms approached the egg- pit they seemed to be drawn by some attractive force to the mouth of the little volcano-like pit, and plunged with great rapidity and directness into it. He came to the conclusion that this must be due to the diffusion of some soluble chemical substance from the mouth of the egg-pit, which acted upon the distant sperms, and attracted and guided them to it. He determined to find out what this substance was, but the egg-pits are so minute that it was not possible to collect the attractive substance, if*there, and to make a chemical analysis of it. He therefore proceeded to attempt to solve the problem in another manner. He prepared, by aid of the blowpipe, a very delicate, hairlike glass tube, and breaking it into very short lengths filled each little piece with a different soluble chemical substance, such as might probably be produced by the plant. Then he placed them one by one in a film of water under his microscope, into which he had already introduced a quantity of the active, swimming, screw-like little sperms of the fern's prothallus. He watched to see whether in any case an attractive influence was exerted upon the swimming crowd of sperms. He tried a whole series of possible chemical substances, such as sugar, CHEMICAL ATTRACTION 109 tartaric acid, acetic acid, and other vegetable products, without success — the sperms took no notice. At last (I believe it was the seventeenth of the substances he tried) he filled one of his little tubes with a dilute solution of the acid which is found in pears and apples, and is called " malic acid " (from the Latin " malum," an apple) and placed it as before. A marvellous sight then greeted his eye. He saw the little sperms violently and eagerly swimming to the minute glass tube containing the malic acid, and crowding into it. This, then, was the attractive substance produced by the egg-pit of the fern's prothallus ! The microscopic, screw-like particles of protoplasm are guided in their movement by the dilute stream of malic acid issuing from the egg-pit. It is a curious coincidence that the name of this acid is appropriate as being irre- sistibly attractive to the male fertilising sperms. PferTer gave to this process of the chemical guidance of simple protoplasm — which is in its results similar to that produced by the sense of smell and taste in higher organisms — the name "chemotaxis." It has since been recognised as a general process of great importance in affecting the movements of minute protoplasmic particles —such as the white or colourless corpuscles of the blood (phagocytes) and the ubiquitous swarming bacteria and bacilli. Chemotaxis may cause attraction, and is then called " positive chemotaxis," or it may cause repulsion, when it is called "negative chemotaxis." The chemical sub- stances which produce it are by no means limited to malic acid, but are endless in variety : oxygen gas, as well as various elaborate organic substances, are "positively chemotactic " to many microscopic organisms ; weak acids and such bodies as quinine are negatively chemotactic/ The moving towards and repulsion from other sources of " stimulation " are conveniently spoken of by the use of the same words, " taxis " and " tactic " ; thus the attraction no FERNS THE ANCESTORS OF FLOWERS and repulsion caused by light is called " phototaxis," that caused by moisture " hygrotaxis," and so on. A most important chapter in our knowledge of the activities of protoplasm and of simple protoplasmic cells is based on the study of these attractions and repulsions, which, whilst they appear as arbitrary properties determined by causes which are not immediately evident, are yet capable of modification by experimental alteration of the conditions in which the protoplasm exists, so that we are entitled to speak of " the education " of such microscopic particles by which they can be rendered either more or, on the other hand, less sensitive to " chemotactic " agents. To revert now to the question of the relationship of ferns to higher plants. The following points are of impor- tance : (i) Though true ferns produce from their spores prothalli which carry both sperm-sacs and egg-pits on the same specimen, yet some fern-like plants produce prothalli which carry only egg-pits, and others which carry only sperm-sacs, the two kinds growing side by side from the spores shed by the fern; (2) the spores which produce the female or egg-bearing prothalli are in some cases much larger than those which produce the male, or sperm-sac- bearing prothalli. We then distinguish large female-pro- ducing spores from small male-producing spores ; (3) some ferns — for instance our native Royal fern (Osmunda regalis) — do not produce spores on all the leaflets of a frond, but only on those near the tip, which are narrower and less leaf-like than those lower down (Fig. 10, A). Hence this fern is called "the flowering fern." For the essence of a flower is that it is a set of leaves like the other leaves of the flowering plant, usually not green and flat, as they are, but modified — one or more whorls of them being often coloured and arranged, so as to close over the terminal or tip leaves, which are called " stamens " and " carpels," and bear the reproductive particles (Fig. i o Ill H2 FERNS THE ANCESTORS OF FLOWERS D and E). Many varieties and " sports " of cultivated plants show clearly enough that the stamens are leaves, and that the segments of the central or terminal part, the " pistil," are also leaves — carpellary leaves or " carpels," as they are called. Double-flowers are sports in which all the staminal, or male, and all the carpels, or female structures assume the form of leaves like the coloured circlet called the petals. But sometimes " sports " go further and all take on the colour and structure of green foliage leaves, as is the case in the green rose, of which an example exists in Kew Gardens. In this way it becomes evident that foliage leaves and the close-set whorls of the parts of the flower are all of the same nature, namely, leaves, or " foliar appendages." An examination of the parts of the flower of the finest of English flowers, the common water lily, will convince any doubter that this is true. The modified tip of the frond of the flowering fern is in its nature the same thing as a flower, and would only need to be made a little more compact, and to have its spore- bearing leaflets set in whorls surrounded by others devoid of spores, in order to fully justify us in calling it a " flower." But what about the spores and the two generations, the spore-bearer and the egg-and sperm-bearer of the fern ? How are they represented in the flowering plant ? It is true there is no visible second generation in the flowering plant. But this is not because it is not there ; it is because it is so small and so much altered that it has taken a great deal of time and ingenuity for botanists to find it out. Among ferns there are some which have a very minute sexual generation or prothallus, and the spores of one part may drop on to the fronds of another part and germinate there and give rise to the sexual prothallus without falling to the ground, so that little ferns are seen growing on the surface of the bigger fronds. You may see such ferns , TRANSITION FROM FERNS TO FLOWERS 113 in greenhouses. But there are yet other cases among fern-like plants, in which the big spores mentioned above actually germinate without quitting the leaflet on which they are formed and produce very minute prothalli bearing egg-pits without separation from the spore-bearing fern ! Now, it is no stretch of the imagination to conceive of fern- like plants as having once existed, in which the leaflets bearing large spores should be grouped like the scales of a pine-cone or the whorls of a flower so as to protect the large spores, and that these spores should " germinate " beneath their coats each where it is fixed, thus producing without falling from its place of origin a minute, solid, little prothallus, which in due course produces one or more egg- pits, each holding a single egg-cell. Each such leaflet is a carpel or carpellary leaf. At the same time the leaflets carrying the small spores destined to produce prothalli, which will carry only sperm-sacs, must be supposed to have formed either a separate male cone or a male flower, or to have arranged themselves around the female carpels as stamens or staminal leaflets. We shall see what happens to the small spores which they produce. How, then, are we to suppose that fertilisation took place ? The extinct plants in which these changes actually arose were not small or aquatic in habit. They were well grown shrubs and trees. This is what occurred. The staminal or male leaflets produced their small spores in spore-cases (the anthers), and the cases burst, setting free the male-prothallus-producing spores, which are, in fact, the same thing as the pollen grains of higher plants. Unlike the female-prothallus-producing spores, or big spores, they do not remain in place, but are shed in showers of millions into the air. They are blown by the wind (as we see to-day in the case of pines and many other trees), and are carried by it to the female or car- pellary cones, or maybe to rosette-like female flowers. 8 II4 FERNS THE ANCESTORS OF FLOWERS The dispersal of the male-spores, or pollen, by wind was the earlier method ; it was not until a late geological period — the cretaceous, or chalk — that (as their fossil remains show us) insects capable of feeding on the honey of flowers, and coloured flowers capable of attracting the insects by sight, came into existence ; and it is since that period that all the wonderful relations and adaptations of flower to insect, and insect to flower, have been brought about. Before that, the wind-blown pollen-grains, or male- prothallus-spores, were in such profusion that some of them were carried by the wind to the surface of the car- pellary leaflets of the female cones, or rosettes, as occurs to-day in the pine-trees which shed enormous quantities of pollen-dust in the spring. There the pollen spore germinated instead of waiting to reach the ground and produce its little thread-like prothallus. In early geological times (Oolitic) — as we know from certain rare trees which have persisted from those times, when they were very abundant, to this day, viz. the Japanese Gingko tree, or Maiden's Hair fern-tree, and the Cycads, or palm-conifers — the little " prothallus " which emerged out of the pollen- spore was not a simple filament as it is in the case of the pollen of our modern flowering plants. The pollen-spore of the Gingko tree and the Cycads actually produces in these survivors of primitive forms at least one sperm-sac containing liquid in which are motile sperms. And the egg-pit of the female prothallus developed from the big spores borne by the carpellary leaflets of the female flowers is not so reduced or simple a thing as it is in modern flowering plants. It is a real pit containing liquid, and the motile sperms from the pollen's prothallus which pushes itself into the little pit, are liberated and swim about in the liquid of the reservoir or chamber formed by the egg-pit, and then fuse with the egg-cells there em- bedded and fertilise them. We see there is still a great THE GINGKO TREE AND GVCADS 115 deal of the separate sexual generation retained. Much of this has been done away with in the process of time in the course of those changes which have given us the .great modern group of flowering plants and trees. Thefe is in modern flower-bearing trees and herbs no pit, pro- vided by the female prothallus, containing liquid for the motile sperms to swim about in ; the pollen-prothallus no longer produces motile sperms. It does not even divide into a chain of cells, but becomes a very small thread called the "pollen-tube," and makes its way by growth into contact with the egg-cell embedded in loose tissue, and itself fuses with the egg-cell. Thus, in the modern group of flowering plants, the female prothallus is reduced to a solid particle of tissue in which an egg-cell is set, and the male prothallus does not even arrive at the dignity of forming cells and tissue, let alone sperms ; it is a simple protoplasmic filament which issues from the " small spore " or pollen grain. In the living survivors of the great forests of Gingko trees and Cycad-like plants intermediate between ferns and modern flowering plants which flourished in the oolitic period, two Japanese botanists, Hirase and Ikeno, discovered twenty years ago that the pollen-grains — the male fertilising spores (familiar in all our modern flowering plants) — when carried on to the female flowers, produce by cell-division a growth like the little green "prothallus" of the fern, and that this growth, penetrating the female structures, gives rise to actively swimming sperms (as does the prothallus of a fern), which are received into a liquid- holding cavity of the egg-producing growth of the female spores. These female spores and the little egg-producing plants to which they give rise remain attached to and fixed on the leaf where they originate, instead of being shed, as in the case of ferns ; but the same process of fertilisation by sperms which swim freely in liquid takes n6 FERNS THE ANCESTORS OF FLOWERS place in the Gingko and the Cycads as occurs in the detached, separately growing sexual generation or " pro- thallus " of the fern. These remarkable survivals of the fern-stage of develop- ment are suppressed in the modern " flowering plants," the pine trees and the whole host of trees and herbs which bear "flowers." In them there are no "sperms," but the pollen- spore gives rise, when carried to the carpels or female leaves, to a minute hair-like filament, almost devoid of structure. The pollen filament, thus growing, penetrates the tissues surrounding the equivalent of the egg- bearing "pro- thallus," which is never shed, but remains fixed to the female leaf on which it originated. Thus the ovule or egg-cell is "fertilised," so to speak "in place," by the pollen filament itself without the production of any separate "sperms." The sexual or "prothallus" generation of the fern is in fact reduced and becomes, so far as the female is concerned, a minute part of the large spore-bearing plant or first gene- ration, whilst so far as the male spore (pollen) is concerned, it is detached as in ferns, but never develops further than the condition of a tiny filament, and never produces sperms. No one would ever guess that such a history lay behind the pollen and the seed of our common plants on first acquaintance with them. The discovery was one of the many great triumphs of scientific investigation in the second half of "the wonderful century" which closed ten years ago. The fertilised ovule or egg-cell of the flowering plant is contained in an envelope and packing of more or less numerous " coats." It swells up when fertilised and com- mences to grow within its case as a young plant, and is said to be a ripe and fully-formed " seed " when its envelope becomes hard and protective. The formation of what is properly called " seed " is a protective process in which the young embryo, already well advanced in growth, is en- EXTINCT SEED-PRODUCING FERNS 117 veloped in a variety of ways in different instances and is arrested for a time, often a very long time, in its further growth. The envelopes may be big or small, whilst the living germ within — sometimes minute, sometimes big, as in the bean, and bigger still in the cocoa-nut — is further protected and assisted in its dispersal by the swelling up, around the seeds, of the substance of the carpels or big spore-bearing leaves, to form the "fruit." Nothing like a seed (that is, a true seed in the botanical sense), nor anything corresponding to a fruit is developed in true ferns, but there were ancient ferns (in the coal-measures) which are shown by well-preserved fossils to have produced attached "seeds" instead of detached prothalli, and consti- tute a group called " seeding ferns." They lead on to primitive cycads (so-called fern-cycads) and primitive coni- fers in the succeeding Oolitic age, from which our modern flowering plants and pine trees have finally arisen. Our ferns of to-day often attain the size of trees (the tree-ferns in Australasia are 50 feet high), but they remain at the lower stage of elaboration of the reproductive process. The extinct " seeding ferns " formed the step leading on to further changes, and they have left no survivors of precisely their own grade of development. The gradual develop- ment of the flower and the fruit followed in their offspring by steps which have been very largely ascertained in fossil remains of the Oolitic period. The development of the colours and shapes of our modern dominant flowering plants under the influence of insects was a later step, in tracing which the fossilised remains of plants and animals give us only the negative indication that there were neither such flowers nor such insects until the chalk period — that landmark of geologic progress which in many ways marks off the more modern animals and plants of the Tertiary period from the Secon- dary, in which great reptiles and the ancient cycads and n8 FERNS THE ANCESTORS OF FLOWERS gingko-trees flourished. It is a very curious and significant fact, when one thinks it over, that the beautiful shapes and colours of flowers which human beings admire and love so much to-day, have been produced by the habit of insects seeking honey and pollen as nourishment from flowers which were at first dull-coloured or green, but became brilliant in colour and arresting in shape by natural selection and survival of the fit. Those flowers which at first by variation — variation which always and simply must occur, because all nature varies and changes in detail as time goes on — showed a patch of colour, were seen and visited by the insects, were accordingly fertilised by the pollen carried on the body of the insect, and so were favoured and transmitted their variation, their ten- dency to produce colour, to their offspring. Thus, through the agency of the insects, bright obvious flowers of various colours and shapes were little by little developed. At first a little colour would gain success, but more and more, in the competition for place and nourishment, the brightest and (to the insects) most attractive colourings and shapes would gain favour and multiply. And so at last we have that world of beauty — the flowers as we see them to-day in all their loveliness of colour and pattern — created, pro- duced, even as man produces new garden kinds, by those innocent little horticulturists — the flower-seeking insects. CHAPTER IX ELEPHANTS IN the novel by that clever but contradictious writer, Sam Butler, entitled 'The Way of All Flesh,' an amiable and philosophically minded old gentleman, who pervades the story, states that when one feels worried or depressed by the incidents of one's daily life, great comfort may be derived from an hour spent at the Zoological Gardens in company with the larger mammalia. He ascribes to them a remarkable soothing influence, and I am inclined to agree with him. I am not prepared to decide whether the effect is due to the example of patience under adversity offered by these animals, or whether it is perhaps their tranquil indifference to everything but food, coupled with their magnificent success in attaining to such dignity of size, which imposes upon me and fills me for a brief space with resignation and a childlike acquiescence in things as they are. The elephant stands first as a soothing influence, and then the giraffe, the latter having special powers, due to its beautiful eyes and agreeable perfume. Sometimes the hippopotamus may diffuse a charm of his own, an aura of rotund obesity, especially when he is bathing or sleeping ; but there are moments when one has to flee from his presence. I never could get on very well with rhinoceroses, but the large deer, bison, and wild cattle have the quality detected by Mr. Butler. So has the gorgeous, well-grown tiger, in full measure, when he 120 ELEPHANTS purrs in answer to one's voice : but the lion is pompous, irritable, and easily upset. He never purrs. He is unpleasantly and obscurely spotted. He seems to be afraid of losing his dignity, and to be conscious of the fact that his reputation — like that of some English officials — depends on the overpowering wig which he now wears, though his Macedonian forerunner had no such growth to give an illusive appearance of size and capacity to his head. However opinions may differ about these things, all will agree that the elephant (or " Oliphant," as he was FIG. II. — The Indian elephant (Elephas maximus or indicus). Observe the small size of its ear-flap. called in France 400 years ago) is the most imposing, fascinating, and astonishing of all animals. At the present day there are two species only of elephant existing on the earth's surface. These are the Indian (Fig. 11) (called Elephas indicus, but sometimes called Elephas maximus on account of the priority which belongs to that designation, although the Indian elephant is smaller than the other), and the African (Fig. 1 2) (called Elephas Africanus). In the wild state their area of occupation has become greatly diminished within historic times. The Indian elephant was hunted in Mesopotamia THE INDIAN AND AFRICAN ELEPHANT 121 in the twelfth century B.C., and Egyptian drawings of the eighteenth dynasty show elephants of this species brought as tribute by Syrian vassals. To-day the Indian elephant is confined to certain forests of Hindoostan, Ceylon, Burma, and Siam. The African elephant extended 100 years ago all over South Africa, and in the days of the Carthaginians was found near the Mediterranean shore, whilst in prehistoric (late Pleistoscene) times it existed in the south of Spain and in Sicily. Now it is confined to X2 FIG. 12. — The African elephant (Elephas africanus) with rider mounted on its back. The drawing is an enlarged representation of an ancient Carthaginian coin. the more central and equatorial zone of Africa, and is yearly receding before the incursions and destructive attacks of civilised man. At no great distance of time before the historic period, earlier, indeed, than the times of the herdsmen who used polished stone implements and raised great stone circles, namely, in the late pleistocene period, we find that there existed all over Europe and North Asia and the northern part of America another elephant very closely allied to the 122 ELEPHANTS Indian elephant, but having a bow-like outward curvature of the tusks, their points finally directed towards one another, and a thick growth of coarse hair all over the body. This is " the mammoth," the remains of which are found in every river valley in England, France and Germany, and of which whole carcases are frequently dis- covered in Northern Siberia, preserved from decay in the frozen river gravels and " silt." The ancient cave-men of France used the fresh tusks of the mammoth killed on the spot for their carvings and engravings, and from their time to this the ivory of the mammoth has been, and remains, in constant use. It is estimated that during the last two centuries at least I oo pairs of mammoths' tusks have been each year exported from the frozen lands of Siberia. In early mediaeval times the trade existed, and some ivory carvings and drinking horns of that age appear to be fashioned from this more ancient ivory. Already, then, within the human period we find elephants closely similar to those of our own time, far more numerous and more widely distributed than in our own day, and happily established all over the temperate regions of the earth — even in our Thames Valley and in the forests where London now spreads its smoky brickwork. When we go further back in time — as the diggings and surveying of modern man enable us to do — we find other elephants of many different species, some differing greatly from the three species I have mentioned, and leading us back by gradual steps to a comparatively small animal, about the size of a donkey, without the wonderful trunk or the immense tusks of the later elephants. By the discovery and study of these earlier forms we have within the last ten years arrived at a knowledge of the steps by which the elephant acquired in the course of long ages (millions of years) his " proboscis " (as the Greeks first called it), and I will later sketch that history. . SIZE OF MODERN ELEPHANTS 123 But now let us first of all note some of the peculiarities of living elephants and the points by which the two kinds differ from one another. The most striking fact about the elephant is its enormous size. It is only exceeded among living animals by whales ; it is far larger than the biggest bull, or rhinoceros, or hippopotamus. A fair-sized Indian elephant weighs two to three tons (Jumbo, one of the African species, weighed five), and requires as food 60 Ib. of oats, li truss of hay, ij truss of corn a day, costing together in this country about 5 s. ; whereas a large cart-horse weighs I 5 cwt, and requires weekly three trusses of hay and 80 Ib. of oats, costing together 1 2s.t or about I s. 8^. a day. It is this which has proved fatal to the elephant since man took charge of the world. The elephant requires so much food and takes so many years in growing up (twenty or more before he his old enough to be put to work), that it is only in countries where there is a superabundance of forest in which he can be allowed to grow to maturity at his own " charges " (so to speak) that it is worth while to attempt to domesticate and make use of him. For most purposes three horses are more " handy" than one elephant. The elephant is caught when he is already grown up, and then trained. It is as a matter of economy that he is not bred in confinement, and not because there is any insuper- able difficulty in the matter. Occasionally elephants have bred in menageries. There is no doubt that the African elephant at the present day grows to a larger size than the Indian, though it was the opinion of the Romans of the Empire that the Indian elephant was the more powerful, courageous, and intelligent of the two. It seems next to impossible to acquire at the present day either specimens or trustworthy records of the largest Indian elephants. About loft. 6 in. at the shoulder seems to be the maximum, though they £re dressed up by their native owners with platforms and 124 ELEPHANTS coverings to make them look bigger. In India the skin of domesticated individuals is polished and carefully stained, like an old boot, by the assiduity of their guardians, so that a museum specimen of exceptional size, fit for exhibition and study, cannot be obtained. On the other hand, the African elephant not unfrequently exceeds a height of 1 1 ft. at the shoulder. With some trouble I obtained one exceeding this measurement direct from East Africa for the Natural History Museum, where it now stands. It seems highly probable that this species occasionally exceeds 12 ft. in height. On the ground, between the great African elephant's fore and hind legs, in the museum, I placed a stuffed specimen of the smallest terrestrial mammal — the pigmy shrew-mouse. It is worth while thus calling to mind that the little animal has practi- cally every separate bone, muscle, blood-vessel, nerve, and other structure present in the huge monster compared with it — is, in fact, built closely upon the same plan, and yet is so much smaller that it is impossible to measure one by the other. The mouse is only about one fifth the length of the elephant's eye. According to ancient Oriental fable, the mouse and the dragon were the only two animals of which the elephant was afraid. The African elephant has much larger tusks relatively to his size than the Indian, and both males and females have them, whereas the Indian female has none. A very fine Indian elephant's tusk weighs from 75lb. to 80 Ib. The record for an African elephant's tusk was (according to standard books) 1 80 Ib. But I obtained ten years ago for the museum, where it now may be seen, an African elephant's tusk weighing 228^1b. Its fellow weighed a couple of pounds less. It measures I oft. 2 in. in length along the curvature. This tusk was recognised by Sir Henry Stanley's companion, Mr. Jephson, when he was with me in the museum, as actually one which he had last EARS AND TEETH OF ELEPHANTS 125 seen in the centre of Africa. He told me that he had, in fact, weighed and measured this tusk in the treasury of Emin Pasha, in Central Africa, when he went with Stanley to bring Emin down to the coast. As will be remembered, Emin had no wish to go to the coast, but returned to his province. He was subsequently attacked and murdered by an Arab chief, who appropriated his store of ivory, and in the course of time had it conveyed to the ivory market at Zanzibar. The date of the purchase there of the museum specimen corresponds with the history given by Mr. Jephson. The African elephant (as may be seen by comparing the small one now living in Regent's Park with its neigh- bours) has a sloping forehead graduating into the trunk or proboscis, instead of the broad, upright brow of the Indian. He also has very much larger ears, which lie against the shoulders (except when he is greatly excited) like a short cape or cloak (see Fig. 12). These great ears differ somewhat in shape in the elephants of different parts of Africa, and local races can be distinguished by the longer or shorter angle into which the flap is drawn out. The grinding teeth of the two elephants differ very markedly, but one must see these in a museum. The grinders are very large and long (from behind forwards), coming into place one after the other. Each grinder occupies, when fully in position, the greater part of one side of the upper or of the lower jaw. They are crossed from right to left by ridges of enamel, like a series of mountains and valleys, which gradually wear down by rubbing against those of the tooth above or below. The biggest grinder of the Indian elephant has twenty-four of these transverse ridges, whilst that of the African has only eleven, which are therefore wider apart (See Fig. 13). An extinct kind of elephant — the mastodon — had only five such ridges on its biggest grinders, and four or 126 ELEPHANTS only three on the others. Other ancestral elephants had quite ordinary-looking grinders, with only two or three irregular ridges or broad tubercles. Both the Indian and African elephant have hairless, rough, very hard, wrinkled skins. But the newborn young are covered with hair, and some Indian elephants living in cold, mountainous regions appear to retain a certain amount of B FlG. 13. — The crowns of three "grinders" or molars of elephants compared. A is that of an extinct mastodon with four transverse ridges ; B is that of the African elephant with nine ridges in use and ground flat ; c is that of the mammoth with sixteen narrow ridges in use — the res*t, some eight in number, are at the left hand of the figure and not yet in use. hair through life. The mammoth (which agreed with the Indian elephant in the number of ridges on its grinders and in other points) lived in quite cold, sub-Arctic condi- tions, at a time when glaciers completely covered Scandi- navia and the north of our islands as well as most of WHEN ELEPHANTS BROUGHT TO EUROPE 127 Germany. It retained a complete coat of coarse hair throughout life. The young of our surviving elephants only exhibit transitorily the family tendency. The last mammoth probably disappeared from the area which is now Great Britain about 150,000 years ago. It might be supposed that no elephant was seen in England again until the creation of " menageries " and " zoological Gardens " within the last two or three hundred years. This, however, is by no means the case. The Italians in the middle ages, and through them the French and the rulers of Central Europe, kept menageries, and received as presents, or in connection with their trade with the East and their relations with Eastern rulers, frequent specimens of strange beasts from distant lands. Our King Henry I, had a menagerie at Woodstock, where he kept a porcu- pine, lions, leopards, and a camel ! The Emperor Charlemagne received in 803 A.D. from Haroun al Raschid, the Caliph of Bagdad, an elephant named Abulabaz. It was brought to Aix-la-Chapelle by Isaac the Jew, and died suddenly in 8 1 o. Some four and a half centuries later (in 1257), Louis IX, of France, returning from the Holy Land, sent as a special and magnificent present to Henry III, King of England (according to the chronicle of Matthew Paris), an elephant which was ex- hibited at the Tower of London. It was supposed by the chronicler to be the first ever brought to England, and indeed the first to be taken beyond Italy, for he did not know of Charlemagne's specimen. In 1591 King Henry IV of France, wishing to be very polite to Queen Elizabeth of England, and apparently rather troubled by the expense of keeping the beast himself, sent to her, having heard that she would like to have it, an elephant which had been brought from the " Indies " and landed at Dieppe. He declared it to be the first which had ever come into France, but presented it to Her Majesty " as I 128 ELEPHANTS would most willingly present anything more excellent did I possess it." Thenceforward elephants were from time to time exhibited at the Tower, together with lions and other strange beasts acquired by the Crown. None of these elephants were, however, " the first who ever burst " into remote Britain after the mammoths had disappeared, and we were separated from Europe by the geological changes which gave us the English Channel — La Manche. Though Julius Caesar himself does not mention it, it is definitely stated by a writer on strategy named Polyaenus, a friend of the Emperor Marcus Aurelius, but not, I am sorry to say, an authority to whose statements historians attach any serious value — that Caesar made use of an elephant armed with iron plates and carrying on its back a tower full of armed men to terrify the ancient Britons when he crossed the Thames — an operation which he carried out, I believe, somewhere between Molesey and Staines. Elephants are often spoken of as " Ungulates," and classed by naturalists with the hoofed animals (the odd-toed tapirs, rhinoceroses, and horses, and the even-toed pigs, camel, cattle, and deer). But there is not much to say in defence of such an association. The elephants have, as a matter of fact, not got hoofs, and they have five toes on each foot. The five toes of the front foot have each a nail, whilst usually only four toes of the hind foot have nails. A speciality of the elephant is the great circular pad of thick skin overlying fat and fibrous tissue, which forms the sole of the foot and bears the animal's enormous weight. This buffer-like development of the foot existed in some great extinct mammals (the Dinoceras family, of North America), but is altogether different from the support given by a horse's hoof or the paired shoe-like hoofs of great cattle or the three rather elegant hoofed toes of the rhinoceros. THE ELEPHANT'S LEGS 129 The Indian elephant likes good, solid ground to walk on, and when he finds himself in a boggy place will seize any large objects (preferably big branches of trees) and throw them under his feet to prevent himself sinking in. Occasionally he will remove the stranger who is riding on his back and make use of him in this way. The circum- ference of the African elephant's fore-foot is found by hunters to be half the animal's height at the shoulder, and is regarded as furnishing a trustworthy indication of his stature. The legs of the elephant differ from those of more familiar large animals in the fact that the ankle and the wrist (the so-called knee of the horse's fore-leg) are not far above the sole of the foot (resembling man's joints in that respect), whilst the true knee-joint (called "the stifle " in horses) — instead of being, as in horses, high up, close against the body, strongly flexed even when at rest, and obscured by the skin — is far below the body, free and obvious enough. In fact, the elephant keeps the thigh and the upper arm perpendicular and in line with the lower segment of the limb when he is standing, so that the legs are pillar-like. But he bends the joints amply when in quick movement. The hind legs seen in action resemble, in the proportions of thigh, fore-leg, and foot, and the bending at the knee and ankle, very closely those of a man walking on " all fours." The elephant as known in Europe more than 300 years ago was rarely seen in free movement. He was kept chained up in his stall, resting on his straight, pillar-like legs and their pad-like feet. And with that curious avidity for the marvellous which characterised serious writers in those days to the exclusion of any desire or attempt to ascertain the truth, it was coolly asserted, and then commonly believed, that the elephant could not bend his legs. Shakespeare — who, of course, is merely using a common 9 130 ELEPHANTS belief of his time as a chance illustration of human character — makes Ulysses say (referring to his own stiffness of carriage) (" Troilus and Cressida," Act II) : " The elephant hath joints, but none for courtesy ; his legs are legs for necessity, not for flexure." An old writer says : " The elephant hath no joints, and, being unable to lye down, it lieth against a tree, which, the hunters observing, do saw almost asunder ; whereon the beast relying — by the fall of the tree falls also down itself, and is able to rise no more." Another old writer (Bartholomew, 1485), says, more correctly : " When the elephant sitteth he bendeth his feet ; he bendeth the hinder legs right as a man." A writer of 1 20 years later in date (Topsell) says : " In the River Ganges there are blue worms of sixty cubits long having two arms ; these when the elephants come to drink in that river take their trunks in their hands and pull them off. At the sight of a beautiful woman elephants leave off all rage and grow meek and gentle. In Africa there are certain springs of water which, if at any time they dry up, they are opened and recovered again by the teeth of elephants." The blue worm of the Ganges referred to is no doubt the crocodile ; both in India and Africa animals coming to the rivers to drink are seized by lurking crocodiles, who fix their powerful jaws on to the face (snout or muzzle) of the drinking animal and drag it under the water. Thus the fable has arisen of the origin of the elephant's trunk as recounted by Mr. Rudyard Kipling. A young elephant (before the days of trunks), according to this authority, when drinking at a riverside had his moderate and well-shaped snout seized by a crocodile. The little elephant pulled and the crocodile pulled, and by the help of a friendly python the elephant got the best of it. He extricated himself from the jaws of death. But, oh ! what a difference in his appearance ! His snout was drawn out so as to form that wonderful TUSKS USED IN DIGGING 131 elongated thing with two nostrils at the end which we call the elephant's trunk, and was henceforth transmitted (a first-rate example of an " acquired character ") to future generations ! The real origin of the elephant's trunk is (as I will explain later) a different one from that handed down to us in the delightful jungle-book. I do not believe in the hereditary transmission of acquired modifications ! Topsell may or may not be right as to the result produced on elephants by the sight of a beautiful woman. In Africa the experiment would be a difficult one, and even in India inconclusive. Topsell seems, however, to have come across correct information about the digging for water by an African elephant by the use of his great tusks — those tusks for the gain of which he is now being rapidly exterminated by man. Serious drought is frequent in Africa, and a cause of death to thousands of animals. African elephants, working in company, are known to have excavated holes in dried-up river beds to the depth of 2 5 ft. in a single night in search of water. It is probable that the Indian elephant's tusk would not be of service in such digging, and it is to be noted that he is rather an inhabi- tant of high ground and table-lands than of tropical plains liable to flood and to drought. The tusk of the Indian elephant has become merely a weapon of attack for the male, and there are even local breeds in which it is absent in the males as well as in the females. The mammoth was a near cousin of the Indian elephant, and inhabited cold uplands and the fringes of sub-Arctic forests, on which he fed. His tusks were very large, and curved first outward and then inward at the tips. They would not have served for heavy digging, and probably were used for forcing a way through the forest and as a protection to the face and trunk. The trunk of the elephant was called " a hand " by old I32 ELEPHANTS writers, and it seems to have acted in the development of the elephant's intelligence in the same way as man's hand has in regard to his mental growth, though in a less degree. The Indian elephant has a single tactile and grasping projection (sometimes called " a ringer ") placed above between the two nostrils at the end of the trunk ; the African elephant has one above and one below. I have seen the elephant pick up with this wonderful trunk with equal facility a heavy man and then a threepenny piece. The intelligence of the elephant is sometimes exag- gerated by reports and stories ; sometimes it is not suffi- ciently appreciated. It is not fair to compare the intelligence of the elephant with that of the dog — bred and trained by man for thousands of years. So far as one can judge, there is no wild animal, excepting the higher apes, which exhibits so much and such varied intelligence as the elephant. It appears that from early tertiary times (late Eocene) the ancestors of elephants have had large brains, whilst, when we go back so far as this, the ancestors of nearly all other animals had brains a quarter of the size (and even less in proportion to body-size) which their modern representatives have. Probably the early possession of a large brain at a geological period when brains were as a rule small is what has enabled the elephants not only to survive until to-day, but to spread over the whole world (except Australia), and to develop an immense variety and number of individuals throughout the tertiary series in spite of their ungainly size. It is only the yet bigger brain of man which (would it were not so !) is now at last driving this lovable giant, this vast compound of sagacity and strength, out of existence. The elephant — like man standing on his hind legs — has a wide survey of things around him owing to his height. He can take time to allow of cerebral intervention in his actions since he is so large that he has little cause to be afraid and to hurry. He has a fine and delicate exploring organ in ELEPHANTS USED IN WAR 133 his trunk, with its hand-like termination ; with this he can, and does, experiment and builds up his individual knowledge and experience. Elephants act together in the wild state, aiding one another to uproot trees too large for one to deal with alone. They readily understand and accept the guid- ance of man, and with very small persuasion and teaching execute very dextrous work — such as the piling of timber. If man had selected the more intelligent elephants for breeding over a space of a couple of thousand years a prodigy of animal intelligence would have resulted. But man has never " bred " the elephant at all. The Greeks and Romans knew ivory first, and then became acquainted with the elephant. The island of Elephantina in the Nile was from the earliest times a seat of trade in the ivory tusks of the African elephant, and so acquired its name. Herodotus is the first to mention the elephant itself; Homer only refers to the ivory by the word " elephas." Aristotle in this, as in other matters, is more correct than later writers. He probably received first-hand information about the elephant from Alexander and some of his men after their Indian expedition. The Romans had an unpleasant first personal experience of elephants when Pyrrhus, King of Epirus, landed a number with his army and put the Roman soldiers to flight. But the Romans then, and continually in after-times, showed their cool heads and sound judgment in a certain contempt for elephants as engines of war. They soon learned to dig pits on the battlefield to entrap the great beasts, and they deliberately made for the elephant's trunks, hewing them through with their swords, so that the agonised and maddened creatures turned round and trampled down the troops of their own side. The Romans only used them subsequently to terrify barbaric people, and as features in military processions. But Eastern nations used them extensively in war. In A.D. 217 Antiochus the Great 134 ELEPHANTS brought 2 1 7 elephants in his army against 73 employed by Ptolemy, at what was called "the Battle of the Elephants." The battle commenced by the charging head to head of the opposing elephants and the discharge of arrows, spears and stones by the men in the towers on their backs. An interesting question has been raised as to whether the elephants used by the Carthaginians were the African species or the Indian. There is no doubt that the ele- phants of Pyrrhus and those known to Alexander were the Indian, though they were taken in those days much to the West of India, namely, in Mesopotamia, and it would not have been difficult for the Cathaginians to convey Indian elephants, which had certainly been brought as far as Egypt, along the Mediterranean coast. An unfounded prejudice as to the want of docility of the African elephant has favoured the notion that the Carthaginians used the Indian elephant. As a matter of fact, no one in modern times has tried to train the African elephant, except here and there in a zoological garden. Probably the Indian " mahout," or elephant trainer could, if he were put to it, do as much with an African as he does with an Indian elephant. It would be an interesting experiment. In the next place, there is decisive evidence that it was the African elephant which the Carthaginians used, since we have a Carthaginian coin (Fig. 12) on which is beautifully repre- sented— in unmistakable modelling — the African elephant, with his large triangular cape-like ears and his sloping forehead. In the time of Hannibal there were stables for over 300 of these elephants at Carthage, and he took fifty with him to the South of France with his army for the Italian invasion. He only got thirty-seven safely over the Rhone, and all but a dozen or so died in the terrible passage of the Alps. After the battle of Trebia he had only eight left, and when he had crossed the Apennines there was only one still alive, On this Hannibal himself rode. GEOLOGICAL STRATA SINCE THE CHALK 135 Since the period when the white chalk which now forms our cliffs and hills was deposited at the bottom of a vast and deep ocean — the sea bottom has been raised, the chalk has emerged and risen on the top of hills to 800 ft in height in our own islands, and to ten times that height elsewhere, and during that process sands and clays and shelly gravels have been deposited to the thickness of some 2800 ft. by seas and estuaries and lakes, which have come and gone on the face of Europe and of other parts of the world as it has slowly sunk and slowly risen again. The last 200 ft. or so of deposits we call the Pleistocene or Quaternary ; the rest are known as the Tertiary strata. They are only a small part of the total thickness of aqueous deposit of stratified rock — which amounts to 60,000 ft. more before the earliest remains of life in the Cambrian beds are reached, whilst older than, and therefore below this, we have another 5 0,000 ft. of water-made rock which yields no fossils — no remains of living things, though living things were certainly there ! Our little layer of Tertiary strata on the top is, however, very important. It took several million years in forming, although it is only one-fortieth of the whole thickness of aqueous deposit on the crust of the earth. We divide it into Pliocene, Miocene, and Eocene, and each of these into upper, middle, and lower, the Eocene being the oldest. Our London clay and Woolwich sands are lower Eocene ; there is a good deal of Miocene in Switzerland and Germany, whilst the Pliocene is represented by whole provinces of Italy, parts of central France, and by the White and Red " crags " of Suffolk * It is during this Tertiary period that the mammals — the warm-blooded, hairy quadrupeds, which suckle their young * I am inclined to think that the line between Pliocene and Pleistocene or Quaternary ought, in this country, to be drawn between the White and Red Crag of Suffolk. Glacial conditions set in and were recurrent from the commencement of the Red Crag deposit onwards. I36 ELEPHANTS — have developed (they had come into existence a good deal earlier), and we find the remains of ancestral forms of the living kinds of cattle, pigs, horses, rhinoceroses, tapirs, elephants, lions, wolves, bears, etc., embedded in the suc- cessive layers of Tertiary deposits. Naturally enough, those most like the present animals are found in late Pliocene, and those which are close to the common ancestors of many of the later kinds are found in the Eocene, whilst we also find, at various levels of the Ter- tiary deposit, remains of side-branches of the mammalian pedigree, which, though including very powerful and remark- able beasts, have left no line of descent to represent them at the present day. We have been able to trace the great modern one-toed horses, zebras, and asses, with their com- plicated pattern of grinding-teeth back by quite gradual steps (represented by the bones and teeth of fossil kinds of horses), to smaller three-toed animals with simpler tuberculated teeth, and even, without any marked break in the series, to a small Eocene animal (not bigger than a spaniel) with four equal-sized toes on its front foot, and three on its hind foot. We know, too, a less direct series of intermediate forms leading beyond this to an animal with five toes on each foot and " typical " teeth. In fact, no one doubts that (leaving aside a few difficult and doubtful cases) all such big existing mammals, as I mentioned above, as well as monkeys and man, are derived from small mammals — intermediate in most ways between a hedgehog and a pig — which flourished in very early Eocene times, and had five toes on each foot, and " a typical dentition." Even the elephants came from such a small ancestral form. The common notion that the extinct fore-runners of existing animals were much bigger than recent kinds, and even gigantic, is not in accordance with fact. Some extinct animals were of very great size — especially the great reptiles of the period long before the ANCESTRAL MAMMALS 137 Tertiaries, and before the chalk. But the recent horse, the recent elephant, the giraffe, the lions, bears, and others, are bigger — some much bigger — than the ancestral forms, to which we can trace them by the wonderfully preserved and wonderfully collected and worked-out fossilised bones dis- covered in the successive layers of the Pliocene, Miocene, FIG. 14.— Skeleton of the Indian elepkant. Only four toes are visible, the fifth concealed owing to the view from the side. and Eocene strata, leading us as we descend to more primitive, simplified, and smaller ancestors. It is easy to understand the initial character of the foot of the early ancestral mammals. It had five toes. By the suppression or atrophy of first the innermost toe, then of the outermost, you find that mammals may first acquire four toes only, and then only three, and by repeating the. X38 ELEPHANTS process the toes may be reduced to two, or right away to one, the original middle toe. There is no special difficulty about tracing back the elephants in so far as this matter is concerned, since they have kept (like man and some other mammals) the full typical complement of five toes on each foot. But I must explain a little more at length what was the * typical dentition," — that is to say, the exact number and form of the teeth in each half of the upper and the lower jaw of the early mammalian ancestor of lower Eocene times, or just before. The jaws were drawn out into a snout or muzzle, an elongated, protruding " face," as in a dog or deer or hedgehog, and there were numerous teeth set in a row along the gums of the upper and the lower jaw. The teeth were the same in number, in upper and in lower jaw, and so formed as to work together, those of the lower jaw shutting as a rule just a little in front of the corresponding teeth of the upper jaw. There were above and below, in front, six small chisel-like teeth, which we call " the incisors." At the corner of the mouth above and below on each side flanking these was a corner tooth, or dog-tooth, a little bigger than the incisors, and more pointed and projecting. These we call " the canines," four in all. Then we turn the corner of the mouth-front, as it were, and come to the " grinders," cheek-teeth or molars. These are placed in a row along each half of upper and lower jaw. In our early mammalian ancestor they were seven in number, with broader crowns than the peg-like incisors and canines, the bright polished enamel of the crown being raised up into two, three or four cone-like prominences. The back grinders are broader and bigger than those nearer the dog-tooth. The three hindermost grinders in each half of each jaw are not replaced by " second " teeth, whilst all the other teeth are. Now this typical set of teeth — consisting of twenty- TYPICAL OR ANCESTRAL SET OF TEETH 139 eight grinders, four canines, and twelve incisors — is not found complete in many mammals at the present day, though it is found more frequently as we go back to earlier strata.* Though some mammals have kept close to the original number, they have developed peculiar shape and qualities in some of the teeth as well as changes in size. The common pig still keeps the typical number (Fig. 15). But he has developed the corner teeth or canines into enormous tusks both in the upper and lower jaw, and the more anterior grinders have become quite minute. The cats (lions and tigers included) have kept the full number of incisors (see figs. 26 and 27, pp. 160, 161) ; they have developed the four canines into enormous and deadly stabbing " fangs," and they have lost all the grinders but three in each half of the lower jaw and four in each half of the upper jaw (twelve instead of twenty-eight), and these have become sharp-edged so as to be scissor-like in their action, instead of crushing or grinding. Man and the old-world monkeys have lost an incisor in each half of each jaw (see Pis. VII and VIII) ; they retain the canines, but have only five molars in each half of each jaw (twenty in all instead of twenty-eight). Most of the mammals — whatever change of number and shape has befallen their teeth in adaptation to their different requirements as to the kind of food and mode of getting it — have retained a good long pair of jaws and a snout or muzzle consisting of nose, upper jaw, and lower jaw, projecting well in front of the eyes and brain-case. * Mammals having the number and form of teeth which I have just described as typical — or such modification of it as can easily be produced by suppression of some teeth and enlargement of others — are called Typi- dentaU On the other hand, the whales, the sloths, ant-eaters, and arma- dilloes, as also the Marsupials, are called Variodentata, because we cannot derive their teeth from those of the Typidentate ancestor. They form lines of descent which separated from the other mammals before the Typidentate ancestor of all, except the groups just named, was evolved. ELEPHANTS 2 3 4 5 6, 7 Molars UPPER FIG. 15. — The teeth in the upper and lower jaw-bone of the common pig— drawn from photographs. A and B represent the right half of the lower jaw (A) and the right half of the upper jaw (B) seen in horizontal position. Inc. are the incisors or chisel-like front teeth, three in number, in each half of each jaw and marked i, 2, 3. C marks the canine or dog-tooth, which here grows to be a large tusk. The molars, " grinders," or cheek teeth are marked i to 7. Figs, c and D give a side view of the left halves of the upper (c) and of the lower jaw-bone (D), with the teeth in place. The bone has been partly cut away so as to show the fangs or roots of the teeth, which are double in the molars, and even three-fold in molar No. 7. The explanation of the lettering is the same as that given for figs. A and B. The letter p in Fig. B points to a " foramen " or hole in the upper jaw-bone. These drawings are introduced here as show PECULIARITIES OF TEETH OF ELEPHANTS 141 Man is remarkable as an exception. In the higher races of men the jaws are shorter than in the lower races, and project but very little beyond the vertical plane of the eyes, whilst the nose projects beyond the lips. Another exception is the elephant. This is most obvious when the prepared bony skull and lower jaw are examined, but can be sufficiently clearly seen in the living animal. The lower jaw and the part of the upper jaw against which it and its grinders play is extraordinarily short and small, The elephant has, in fact, no projecting bony jaw at all, no bony snout, its chin does not project more than that of an old man, and even the part of the upper jaw into which its great tusks are set does not bend forward far from the perpendicular (Fig. 14). The elephant (see Fig. 14) has no sign of the six little front teeth (incisors) above and below which we find in the typical dentition and in many living mammals, nor of the corner teeth (dog-teeth, or canines). In the upper jaw in front there is the one huge tusk on each side, and in the lower jaw no front teeth at all ! Then as to the grinders. In the elephant these are enormous, with many transverse ridges on the elongated crown, and so big that there is only room for one at a time in each half of upper and lower jaw. Six of these succeed one another in each half of each jaw, and correspond (though greatly altered) to six of the seven grinders of the typical dentition. Are there amongst older fossil elephants and animals like elephants any which have an intermediate condition of the teeth, connecting the extremely peculiar teeth of the ing the complete number of teeth which the ancestor of pigs, goats, elephants, dogs, tigers, men, and even whales possessed. The re- duction in number and the alteration in the shape of the primitive full set of teeth is referred to in the present chapter on " Elephants," and in those on " Vegetarians and their Teeth " (p. 159), and on " A Strange Extinct Beast " (p. 148). 142 ELEPHANTS modern elephants with the typical dentition such as is approached by the pig, the dog, the tapir, and the hedge- hog? There are such links. We know a great many elephants from Pleistocene and Pliocene strata — some from European localities, more from India, and some from America. A little elephant not more than 3 ft. high when adult is found fossil in the island of Malta ; other species were a little larger than the living African elephant. Whilst the Indian elephant has as many as twenty-four cross-ridges on its biggest grinding tooth (Fig. 13) there FIG. 16. — A reconstruction of the extinct American mastodon (Mastodon ohioticus) from a drawing by Prof. Osborne. Other extinct species of mastodon are found in Europe. is a fossil kind which has only six such ridges. But besides true elephants we know from the Pliocene, Miocene, and Upper Eocene of the old world, the remains of elephant-like creatures (some as big as true elephants), which are distinguished by the name " Mastodon" (Fig. 1 6). And, in fact, we are conducted through a series of changes of form by ancient elephant-like creatures which are of older and older date as we pass along the series, and are known as (i) Mastodon, (2) Tetrabelodon, (3) Palaeomastodon, (4) Meritherium, until we come to some- thing approaching the general form of skull and skeleton EXTINCT RELATIVES OF ELEPHANTS 143 and the typical dentition of the early mammalian ancestor. Mastodons of several species are found in Pliocene strata in Europe and Asia ; detached teeth are found in Suffolk. One species actually survived (why, we do not know) in North America into the early human period, and whole skeletons of it are dug out from morasses such as that of FIGS. 17. — A, skull, and B. restored outline of the head of the long- jawed extinct elephant called Tetrabelodon — the name referring to its four large tusks — two above and two below. " Big-bone Lick." The Mastodons had a longer jaw and face than the elephants, though closely allied to them. They bring one nearer to ordinary mammals in that fact, and also in having (when young) two front teeth or incisors in the lower jaw. Their grinders had the crowns less elongated than those of elephants, and there were I44 ELEPHANTS only five cross-ridges — on the biggest — and these ridges tend to divide into separate cones (Fig. 13). So here, too, we are approaching the ordinary mammals, of which we may keep the pig and the tapir in mind as samples. But the Mastodons still had the great trunk and huge tusks of the elephants. Next we must look at Tetrabelodon (Fig. 17), and it is this creature which has really revealed the history of the strange metamorphosis by which elephants were produced. The Tetrabelodon is known as " the long-jawed masto- don," because, as was shown in a wonderfully well-preserved skeleton from the Lower Pliocene of the centre of France, set up in the Paris Museum, it had a lower jaw of enormous length, ending in two large horizontally directed teeth (Fig. 17). Instead of a lower jaw a foot long, as in an elephant or in the common kind of mastodon — this long-jawed kind had a lower jaw 5ft. or 6ft. long! The tusks of the upper jaw were large, and nearly horizontal in direction, bent downwards a little on each side of the long lower jaw. This lower jaw seemed incompre- hensible, almost a monstrosity — until it occurred to me that it exactly corresponds to the elongated upper lip and nose which we call the elephant's trunk — and that the trunk of " Tetrabelodon " must have rested on his long lower jaw. In descending to Tetrabelodon we leave behind us the elephants with hanging unsupported trunk ; the lower jaw here . is of sufficient length to support the great trunk. When the lower jaw shortened in the later mastodons and elephants the trunk did not shorten too, but remained free and depending, capable of large movement and of grasping with its extremity. Photo- graphs, casts, and actual specimens of the extraordinary skull of the long-jawed mastodon or Tetrabelodon and of the creatures mentioned below may be seen in the Natural History Museum. ANCESTORS OF ELEPHANTS 145 Lastly we have the wonderful series of discoveries made about twelve years ago by Dr. Andrews (of the Natural History Museum) of elephant-like creatures in the upper Eocene of the Fayoum desert in Egypt. Palaeomastodon (the name given by Dr. Andrews to one of them) is a " pig- like " mastodon, with an elongated, bony face, the tusks of moderate size, and the lower jaw not projecting more than a few inches beyond them, so that the proboscis is quite short and rests well on it (Fig. 1 8). This animal had six moderate-sized grinders (molars or cheek teeth) on each FIG. 18.— Head of the ancestral elephant — Palaeomastodon — as it appeared in life. It shows, as compared with the earlier ancestor, an elongation both of the snout and the lower jaw. The tusk in the upper jaw has increased in size, but is still small as compared with that of later elephants. (After a drawing by Prof. Osborne.) side of each jaw in position simultaneously, as may be seen in the complete skull shown in Fig 19. Of other teeth it had only the two moderate-sized front tusks above and two very big, chisel-like " incisors " in the front of the lower jaw. Exactly how these were used and for what food no one has yet made out. The remains, which finally bring the elephants into line with the ordinary mammals with typical dentition, were discovered also by Dr. Andrews and named " Meri- IO i46 ELEPHANTS therium" by him, signifying "the beast of the Lake Meris." This creature is not bigger than a tapir, and had the shape of head and face which we see in that and the ordinary hoofed animals (Fig. 20). It had no trunk, and whilst it had six small and simplified mastodon-like grinders in each half of each jaw, it had six incisors in the upper jaw and a canine or corner tooth on each side. In FIG. 19. — Restored model of the skull and lower jaw of the ancestral elephant Palaeomastodon from the upper Eocene strata of the Fayoum Desert, Egypt. It shows the six molar teeth of the upper and lower jaw (left side), the tusk-like upper incisors and the large chisel-like lower incisors in front. the lower jaw there were only two large incisors besides the cheek-teeth or grinders. Not the least interesting point about Meritherium is that it tells us which of the front upper teeth have become the huge tusks of the later elephants. Counting from the middle line there are in Meritherium three incisors right and three left. The second of these upper teeth on each side is much larger ORIGIN OF THE ELEPHANT'S TRUNK 147 than the others. It is this (seen in Fig. 20) which has grown larger and larger in later descendants of this primitive form and become the elephant's tusk, whilst all the others have disappeared. We now know the complete series of steps connecting elephants with ordinary trunkless, tuskless mammals. The transition from the " beast of Meris " on the one hand to the common typidentate mammalian ancestor, and on the other hand to the elephants, is easy, and FIG. 20. — Head of the early ancestor of elephants— Meritherium — as it appeared in life. Observe the absence of a trunk and the enlarged front tooth in the upper jaw, which is converted in later members of the elephant-stock or line of descent into the great tusk. (After a drawing by Prof. Osborne.) requires no effort of the imagination. His short muzzle (upper and lower jaw), first elongated step by step to a considerable length, giving us Palaeomastodon (Fig. 1 8). Then the lower jaw shrunk and became shorter than it was at the start, and the rest of the muzzle (the front part of the upper jaw, carrying with it the nostrils), drooped and became the mobile muscular elephant's trunk I CHAPTER X A STRANGE EXTINCT BEAST THE terraces of gravel deposited by existing rivers and the deposits in caverns in the limestone regions of Western Europe — the so-called " Pleistocene " strata— contain, besides the flint weapons of man and rare speci- mens of his bones, the remains of animals which are either identical with those living at the present day (though many of them are not living now in Europe) or of animals very closely similar to living species. Thus we find the bones of horses like the wild horse of Mongolia, of the great bull (the Urus of Caesar), of the bison, of deer and goats, of the Siberian big-nosed antelope, of the musk-ox (now living within the Arctic circle), of the wild boar, of the hippopotamus (like that of the Nile), and of lions, hyenas, bears, and wolves. The most noteworthy of the animals like to, but not identical with, any living species are the mammoth, which is very close to the Indian elephant, but has a hairy coat ; the hairy rhinoceros, like, but not quite the same as, the African square-mouthed rhinoceros ; and the great Irish deer, which is like a giant fallow-deer. These three animals are really extinct kinds or species, but are not very far from living kinds. In fact, the most recent geological deposits do not contain any animals so peculiar, when compared with living animals, as to necessitate a wide separation of the fossil animal from living " congeners " by the naturalist who FOSSIL SKELETONS AND JAW-BONES 149 classifies animals and tries to exhibit their degrees of likeness and relationship to one another by the names he adopts for them. The mammoth is a distinct " species " of elephant. It requires, it is true, a " specific " or " second " name of its own ; but it belongs to the genus elephant. Hence we call it Elephas primigenius ; whilst the living Indian elephant is Elephas Indicus. The reader is referred to the preceding chapter for further notes about elephants. The strata next below the Pleistocene gravels and cave deposits are ascribed to the " Pliocene age " — older than these are the " Miocene " and the " Eocene," and then you come to the Chalk, a good white landmark separating newer from older strata. We know now in great detail the skeletons and jaws of some hundreds of kinds of extinct animals of very different groups found in the Eocene, the Miocene, the Pliocene, and the Pleistocene layers of clays, sands, and gravels of this part of the world. Nothing very strange or unlike what is now living is found in the Pleistocene — the latest deposits — but when we go further back strange creatures are discovered, becoming stranger and less like living things as we pass through Pliocene to Miocene, and on — downwards in layers, backwards in time — to the Eocene. Though the past history of the Mediterranean sea shows that it was formerly not so extensive as it is now, and that there were junctions between Europe and Africa across its waters, yet the deeper parts of that sea are very ancient, and some of the islands have long been isolated. In Malta the remains of extraordinary species of minute elephants have been found, one no larger than a small donkey, and in the island of Cyprus an English lady, Miss Dorothea Bate, has discovered the bones of a pigmy hippopotamus (like that still living in Liberia) no larger than a sheep. Miss Bate some three years I5o A STRANGE EXTINCT BEAST ago heard of the existence of a bone-containing deposit of Pleistocene age in lime-stone caverns and fissures in the island of Majorca, and with the true enthusiasm of an explorer determined to carry on some " digging " there and see what might turn up. In the following spring she was there, and obtained a number of bones, jaws, and portions of skulls, which appeared at first sight to be those of a small goat. Its size may be gathered from the fact that FIG. 21. — Side-view of the skull and lower jaw of a goat. inc. i. The three lower incisor teeth of the left side. can. i. The little canine tooth grouped with them. p. The toothless front part of the upper jaw. m. s. Upper molars or " grinders." m. i. Lower molars or grinders. Compare this and the following figures with Fig. 15 showing the more complete " dentition " of the pig. its skull is six inches long. These and the bones of a few small finches were all that rewarded her pains. The bones of fossil goats (of living species) are found in caves at Gibraltar and in Spain ; so at first the result seemed dis- appointing. But on carefully clearing out the specimens THE SKULL AND TEETH OF GOATS 15! and examining them in London, Miss Bate found that the supposed goat bones obtained by her in Majorca were inc. i. Upper Jaw. FIG. 22. — Horizontal view of the teeth in the lower and upper jaw of the goat. In front of the lower jaw the group of three incisors (inc. i.) and one canine is seen, whilst the toothless bony plate (p.) of the upper jaw, against which they work, is seen in the right-hand half of the figure. The molars, " grinders," or cheek-teeth are numbered I to 6 in each jaw. really those of a new and most extraordinary animal, to which (in a paper published in the ' Geological Magazine ' 152 A STRANGE EXTINCT BEAST in September, 1910) she has given the name " Myotragus balearicus? I must ask the reader now to look at the figures here given (Figs. 2 1 and 22) of the skull and the lower jaw of a goat. The lower jaw might (except for size) pass for that of a sheep, ox, antelope or deer. They are all alike. There are on each side six grinding cheek teeth (molars), and then as we pass to the front we find a long, toothless gap until we come to the middle line where the two halves of the jaw unite. FIG. 23. — Side view of the skull of a typical "rodent " mammal, the Coypu rat (Myocastor coypus) from South America, inc. s. Upper incisor, inc. i. Lower incisor, m. s.t m. i. Upper and lower molars, grinders or cheek-teeth. There we see a little semicircular group of eight chisel-like teeth, which work against the toothless pad of the upper jaw opposed to them and are the instruments by which these animals, with an upward jerk of the head, " crop " the grass and other herbage on which they feed, to be after- wards triturated by the grinding cheek teeth. A vast series of living and of fossil animals, called the Ruminants — including the giraffes, the antler-bearing forms called THE TEETH OF RATS deer, the cavicorn or sheath-horned bovines, ovines and cap- rines, and the large series of antelopes of Africa and India — all have precisely this form of jaw, this number and shape and grouping of the teeth. Now let me call to mind the lower jaw of a hare or rabbit or rat (Figs. 23 and 24). inc. i. me. 9. FIG. 24.— View in the horizontal plane of the teeth of the left half of the lower and the left half of the upper jaw of the Coypu rat to show the single great gnawing incisor on each side, the four flat grinding molars and the wide gap between molars and incisors. Compare with Figs. 22 and 27. There we find on each side the group of grinding cheek teeth, with transverse ridges on their crowns, and a long, toothless gap before we arrive at the front teeth. But the front teeth are only two in number, one on each side, 154 A STRANGE EXTINCT BEAST close to each other, very large, and each with a tremen- dously long, deeply set root. They meet a similar pair ot teeth in the upper jaw, and give the hare, rabbit, rats, mice, beavers, and porcupines the power of " gnawing " tough substances. These animals are hence called Rodents, or gnawers, and the two great front teeth are called " rodent- teeth." No arrangement of teeth could be much more unlike than are the group of eight little chisel-like teeth of the lower jaw of the Ruminants and the two enormous gnawing teeth of the Rodents. Apparently the two rodent incisors, or front teeth, of the lower jaw of the rat corre- spond to the two middle incisors of the Ruminant's lower jaw ; the other front teeth of the Ruminant have atrophied, disappeared altogether. The rodent condition has been developed from that of an ancestor which had several front teeth and not two large ones only ; but we have not at present found the intermediate steps. The reader should compare the teeth of the goat and the large rat here pictured with the more typical and complete series of the pig, given in Fig. 15, p. 140. The pig's teeth are the same in number as those of the ancestral primitive typidentate mammal, and their form is near to that of the ancestor's teeth. Now I come to the extraordinary interest of Miss Bate's goat-like or antelope-like animal from Majorca. Although it is shown by its skull (Fig. 25) and other bones to be distinctly one of the sheath-horned ruminants, very like a small goat or antelope, the lower jaw, of which there are several specimens, does not present in front the little group ^f eight small chisel-like " cropping " teeth, but, instead, two enormous rodent teeth placed side by side, very deeply fixed in the jaw, and quite like those of some rat-like animals in shape. Hence the name given to this little marvel by Miss Bate — "Myotragus," "the rat-goat." This strange little animal also differs from goats and antelopes THE RAT-TOOTHED GOAT 155 in having proportionately much thicker and shorter " feet" (cannon-bones) than they have. If the remains of this strange little creature had turned up in more ancient strata — in Pliocene or Miocene — it would not have been quite so astonishing. But it would be still very remarkable, since it has all the characters of a goat-like creature in the shape of its skull, its bony horn- cores, its limb-bones, and its cheek-teeth ; and yet, as it FIG. 25. — Drawing of the skull of the rat-toothed goat, Myotragus — the new extinct beast discovered in limestone fissures in the island of Majorca by Miss Bate. i. Side view of the skull and lower jaw. 2. Appearance of the two rat-like teeth as seen when the end of the lower jaw is viewed from above. were monstrously and in a most disconcerting way, protrudes from its lower jaw two great rats' teeth. Nothing like it or approaching it or suggesting it, is known among recent or fossil Ruminants. They all without exception have a lower jaw with the teeth of the exact number and grouping which you may see in a sheep's lower jaw. We know hundreds of them, both living and fossil, many from the 156 A STRANGE EXTINCT BEAST Pleistocene, others from Pliocene deposits, and even from the still older Miocene, but all keep to the one pattern of lower jaw and lower jaw teeth. It is only in this little island of Majorca, surrounded by very deep water and not known to have nurtured any other animal so large in size either in recent or geologic times, that we come upon a Ruminant with horns like a goat's, but with great rat-like front teeth in place of the semicircle of eight little cropping toothlets. The wonderful thing is that the bones found by Miss Bate are light and well preserved, evidently not very ancient — probably late Pleistocene in age, The questions which arise are : Where did the rat-goat come from ? How did this utterly peculiar change in a Ruminant's teeth come about ? With regard to the second question, it is a matter of importance that although we have hitherto not discovered any Ruminants with this modification of the teeth, still less any cavicorn or sheath- horned Ruminant so altered, yet it is by no means rare amongst herbivorous mammals to find such rat-like teeth making their appearance, whilst the smaller side-teeth of the incisor group or front teeth disappear. The Australian kangaroos and wombats are a case in point — so is the lemur-like aye-aye of Madagascar (an insect eater). So is the Hyrax or "damian" of the Cape, and also the very ancient Plagiaulax from the prae-chalk Purbeck clay. But perhaps the best case for comparison with the Ruminants is that of the Rhinoceroses. There are a great many species and even genera of fossil and recent Rhinoceroses. An old Miocene kind (called Hyracodon) has eight little teeth in the front of the lower jaw. In a Pliocene kind of rhinoceros (called R. incisivus] these are reduced to two, the middle two, which are of great size and project far forward — like those of the rat-goat of Majorca. Among living rhinoceroses the Indian species have these two front teeth, but smaller, whilst the ORIGIN OF THE RAT-TOOTHED GOAT 157 square-mouthed African rhinoceros has none at all ! This helps us, as a parallel, to understand " the strange case " of Myotragus. But, of course, the rhinoceroses are a distinct line of animal descent — remote from Ruminants. They are (like horses and tapirs) odd-toed hoofed-beasts — not even-toed ones, as are pigs, camels, and Ruminants. On first considering the question of the origin of the rat-goat of Majorca, some naturalists will, no doubt, be tempted to suggest that it is a case of a sudden " sport," a " mutation " as they now call it, and not a result of gradual slowly developed reduction of the now lost teeth and correspondingly gradual enlargement of the two middle ones, taking many thousand generations to bring about. The fact that the rat-goat is found on an island cut off from competition with other animals will favour this view. On the other hand, there is the important and really remarkable fact that familiar as man has been for ages with Ruminants of many kinds — such as sheep, goats, cattle, deer — there is absolutely no case on record of an " oddity " or " monstrosity " resembling the rat-goat's con- dition occurring in the teeth of any of the hundreds of thousands of these animals killed and eaten by man, and therefore closely examined. Professor Bateson, who a few years ago ransacked the museums of Europe for instances of "discontinuous variation," or "sports," and wrote a valuable book on the subject, did not discover any example of the kind. Apart from the view, which is very generally held, that such sudden "mutations" as "rat-teeth in a ruminant " are — even should they occur — not perpetuated, we are not really in any way driven to suppose that the rat-goat of Majorca originated in that island. It is true that we know nothing like it in the Pliocene and Miocene of the Mediterranean region which could have been its immediate ancestor. But probably the ancestors of the 158 A STRANGE EXTINCT BEAST rat-goat were slowly developed from a Miocene sheath- horned ruminant, a primitive sort of antelope in some part of North-west Africa, or in an extension of it now sub- merged in the Atlantic, and stragglers of this curious and now lost Ruminant stock were left in Majorca when in Miocene or early Pliocene times that island became detached from its Hispano-African connection. CHAPTER XI VEGETARIANS AND THEIR TEETH NO mistake, said Huxley, is more frequently made by clever people than that of supposing that a cause or an opinion is unsound because the arguments put forward in its favour by its advocates are foolish or erroneous. Some of the arguments put forward in favour of the exclusive use by mankind of a vegetable diet can be shown to be based on misconception and error, and I propose now to mention one or two of these. But I wish to guard against the supposition that I am convinced in consequence that animal substances form the best possible diet for man, or that an exclusively vegetable diet may not, if properly selected, be advantageous for a large majority of mankind. That question, as well as the question of the advantage of a mixed diet of animal and vegetable substances, and the best proportion and quantity of the substances so mixed, must be settled, as also the question as to the harm or good in the habitual use of small quantities of alcohol, by definite careful experiment by competent physiologists, conducted on a scale large enough to give conclusive results. The cogency of the arguments in favour of vegetarianism which I am about to discuss is another matter. In the first place it is very generally asserted by those who advocate a purely vegetable diet that man's teeth are of the shape and pattern which we find in fruit-eating or in root-eating animals allied to him. This is true. The 160 VEGETARIANS AND THEIR TEETH warm-blooded hairy quadrupeds which suckle their young and are called " mammals " (for which word perhaps " beasts " is the nearest Anglo-Saxon equivalent) show in different groups and orders a great variety in their teeth. The birds of to-day have no teeth, the reptiles, amphibians, and fishes have usually simple conical or peg-like teeth, which are used simply for holding and tearing. In some cases the pointed pin-like teeth are broadened out so as to FIG. 26. — Side view of the skull of a clouded tiger (Felis nebulosa) to show the teeth, inc. 3. The three incisors, can. s. Upper canine, corner-tooth, or dog-tooth, can. i. Lower canine, tn. s. The four upper molars or cheek-teeth (called " grinders " in herbi- vorous animals), m. i. The three lower molars or cheek teeth. be button-like, and act as crushing organs for breaking up shell-fish. The mammals alone have a great variety and elaboration of the teeth. In shape and size, as well as in number, the teeth of mammals are very clearly related to the nature of their food in the first place, and secondly to their use as weapons TEETH OF GARNIVORS 161 of attack or of defence. When the surface of the cheek- teeth is broad, with low and numerous tubercles, the food of the animal is of a rather soft substance, which yields to a grinding action. Such substances are fruits, nuts, roots, or leaves, which are " triturated" and mixed with the saliva during the process of mastication. Where the vegetable can.a. -rn.s FIG. 27. — View in the horizontal plane of the teeth of the lower and upper jaw of the same clouded tiger's skull, inc. i. Lower incisors. inc. s. Upper incisors, can. i. and can. s. Lower and upper canine. m. The cheek-teeth — three only in the lower jaw, a minute fourth molar present in the upper. food is coarse grass or tree twigs, requiring long and thorough grinding, transverse ridges of enamel are present on the cheek-teeth, as in elephants, cattle, deer, and rabbits (see Figs. 1 3, 22, 24). Truly carnivorous animals, which eat the raw carcases of other animals, have a different shape of teeth. Not only do they have large and dagger-like II 162 VEGETARIANS AND THEIR TEETH canines or "dog-teeth " as weapons of attack, but the cheek- teeth (very few in number) present a long, sharp-edged ridge running parallel to the length of the jaw, the edges of which in corresponding upper and lower teeth fit and work together like the blades of a pair of scissors. The cats (including the lions, tigers and leopards) have this arrangement in perfection (see Figs. 26 and 27). They cut the bones and muscles of their prey into great lumps with the scissor-like cheek-teeth, and swallow great pieces whole without mastication. Insect-eating mammals have cheek-teeth with three or four sharp-pointed tubercles standing up on the surface. They break the hard-shelled insects and swallow them rapidly. The fish-eating whales have an immense number of peg-like pointed teeth only. These serve as do those of the seals — merely to catch and grip the fish, which are swallowed whole. It is quite clear that man's cheek-teeth do not enable him to cut lumps of meat and bone from raw carcases and swallow them whole, nor to grip live fish and swallow them straight off (PI. VII). They are broad, square-surfaced teeth, with four or fewer low rounded tubercles fitted to crush soft food, as are those of monkeys (see Pis. VIII and IX, and their description). And there can be no doubt that man fed originally, like monkeys, on easily crushed fruits, nuts, and roots. He could not eat like a cat. A fundamental mistake has arisen amongst some of the advocates of vegetarianism by the use of the words " carni- vorous " and " flesh-eating " in an ill-defined way. Man has never eaten lumps of raw meat and bone, and no one proposes that he should do so to-day. Man did not take to meat-eating until he had acquired the use of fire, and had learnt to cook the meat before he ate it. He thus separated the bone and intractable sinew from the flesh, which he rendered friable and divisible by thorough grilling, roasting, or baking. To eat meat thus altered, both chemi- MIXED DIETS 163 cally and in texture, is a very different thing from eating the raw carcases of large animals. Man's teeth are thoroughly fitted for the trituration of cooked meat, which is, indeed, as well suited to their mechanical action as are fruits, nuts, and roots. Hence we see that the objection to a meat diet based on the structure of man's teeth does not apply to the use of cooked meat as diet. The use by man of uncooked meat is not proposed or defended. Yet, further, it is well to take notice of the fact that there are many vegetarian wild animals which do not hesitate to eat certain soft animals or animal products when they get the chance. Thus, both monkeys and primitive men will eat grubs and small soft animals, and also the eggs of birds. Whilst the cat tribe, in regard to the chemical action of their digestive juices, are so specialised for eating raw meat that it is practically impossible for them to take vegetable matter as even a small portion of their diet, and whilst, on the other hand, the grass-eating cattle, sheep, goats, antelopes, deer and giraffes are similarly disqualified from any form of meat-diet, most other land-mammals can be induced, without harm to themselves, to take a mixed diet, even in those cases where they do not naturally seek it. Pigs, on the one hand, and bears, on the other, tend natur- ally to a mixed diet. Many birds, under conditions adverse to the finding of their usual food, will change from vegetable to animal diet, or vice-versd. Sea-gulls normally are fish- eaters, but some will eat biscuit and grain when fish cannot be had. Pigeons have been fed successfully on a meat diet ; so, too, some parrots, and also the familiar barn-door fowl. Many of our smaller birds eat both insects and grain, according to opportunity. Hence it appears impos- sible to base any argument against the use of cooked meat as part of man's diet upon the structure of his teeth, or upon any far-reaching law of Nature which decrees that every animal is absolutely either fitted (internally and 164 VEGETARIANS AND THEIR TEETH chemically, as well as in the matter of teeth) for a diet consisting exclusively of vegetable substances, or else is immutably assigned to one consisting exclusively of animal substances. There is no a priori assumption possible against the use as food by man of nutritious matter derived from animal bodies properly prepared. So far as d priori argument has any value in such a matter, it suggests that the most perfect food for any animal — that which supplies exactly the constituents needed by the animal in exactly right quantity and smallest bulk — is the flesh and blood of another animal of its own species. This is a startling theoretical justification — from the purely dietetic point of view — of cannibalism. It is, however, of no conclusive value ; the only method which can give us conclusions of any real value in this and similarly complex matters is prolonged, full, well-devised, well-recorded experiment. At the same time, we may just note that the favourite food of a scorpion is the juice of the body of another scorpion, and that the same preference for cannibalism exists in spiders, many insects, fishes, and even higher animals. Another line of argument by which some advocates of vegetarianism appeal to the popular judgment is by representing flesh-food derived from animals as something dirty, foul, and revolting, full of microbic germs, whilst vegetable products are extolled as being clean and swe^t — free from odour and putrescence and from the scare- monger's microbes. This, I perhaps need hardly say, is a gigantic illusion and misrepresentation. I came across it the other day in a very unreasonable pamphlet on food by the American writer, Mr. Upton Sinclair. Putrefactive microbes attack vegetable foods and produce revolting smells and poisons in them, just as they do in foods of animal origin. It is true that on the whole more varieties of vegetable food can be kept dry and ready for use by DISEASE GERMS IN FOOD 165 softening with hot water than is the case with foods prepared from animals. This is only a question of not keeping food too long or in conditions tending to the access of putrefactive bacteria. It is, on the whole, more usual and necessary, in order to render it palatable, to apply heat to flesh, fish, and fowl than to fruits. And it is by heat — heat of the temperature of boiling water — applied for ten minutes or more, that poison-producing and infective bacteria are killed and rendered harmless. More people have become infected by deadly parasites and have died from cholera and similar diseases, through having taken the germs of those diseases into their stomachs with raw and over-ripe fruit or uncooked vegetables and the manured products of the kitchen garden, than have suffered from the presence of disease-germs or putrefactive bacteria in well-cooked meat. Here, in fact, " cooking " makes all the difference, just as it does in the matter we were discussing above of the fitness of flesh and bone for trituration by man's teeth. Once we remember that man is not fitted for the " raw meat " diet of the carnivora, but is fitted for the " cooked meat " diet which he has himself discovered — alone of all animals — we shall get rid of a misleading prejudice in the consideration of the question as to whether civilised men should or should not make cooked meat a portion of their diet, with the purpose of maintaining themselves in as healthy and vigorous a state as possible. Do not let us forget that ancient Palaeolithic cave-men certainly made use of fire to cook their meals of animal flesh, and that probably this use of fire dates back to a still earlier period when, in consequence of this application of the red, running tongues of flame, which he had learned to produce, primitive man was able to leave the warmer climates of the earth and their abundant fruits, and to establish him- self in temperate and even sub-Arctic regions, 166 VEGETARIANS AND THEIR TEETH Experiments on a large and decisive scale in regard to the value of the different foods taken by man and the question of the desirability of cooked meat as part of his diet have never been carried out, nor has the use of alcohol been studied by direct experimental method on a large scale. Inasmuch as the feeding of our Army and Navy, of prisoners, lunatics, and paupers, is the business of the State, it is obviously the duty of the Government to inves- tigate this matter and arrive at a decision. It can be done by the Government, and only by the Government. The Army Medical Department is fully capable, and, I am told, desirous, of undertaking this investigation. Five hundred soldiers in barracks would find it no hardship, but an agreeable duty (if rewarded in a suitable way), to submit to various diets, and to comparative tests of the value of such diets. There would be no difficulty in arranging the experimental investigation. Fifty years ago similar work (but not precisely in regard to the questions now raised) was done by the Army Medical Department, under Parkes, with most valuable and widely recognised results. PLATE VII. — The series of teeth in the upper (i) and lower jaw (2) of a modern European (natural size). The teeth are placed closely side by side without a gap — an arrangement which does not occur in the apes nor in any other living mammal, although it is found in some extinct herbivores — the Anoplotherium and the Arsinoitherium. The shape of the arch formed by the row of teeth should be compared with that shown by the same arch in the Gibbon (PI. VII I). The crowns of the teeth are very carefully drawn in this figure, which is from a plate published by Professor Selenka. It must be noted that the number of tubercles on the true molars may be in exceptional cases one more or one less than that given in this drawing which gives the most usual number. The word " molar " is often used to include the five cheek teeth on each side of each jaw, but more strictly the anterior bicuspid teeth are called 11 pre-molars," and the three larger teeth behind them, which have no predecessors or representatives in the first or milk dentition, are called true molars or simply " molars " — a rule we have followed here. PLATE VII. Teeth of the upper jaw of man. Teeth of the lower jaw of man. PLATE VIII. TITS.-- 2. Teeth of the upper and of the lower jaw of the gibbon. EXPLANATION OF PLATES VII AND VIII 167 In both upper and lower jaw we see the four incisors in the middle (Inc. i, Inc. 2) ; on each side of them is the conical crown of a canine — a tooth which is greatly enlarged in the ape (see PI. VIII), but is no larger proportionately than it is here even in the most ancient known human jaw, that from the Pleistocene of Heidelberg (see 'Science from an Easy Chair,' Methuen, 1910, p. 405). The two small bicuspid " premolars " and the three large molars follow these on each side in each jaw. The crown of the most anterior (or "first " ) molar of the upper jaw has four cusps, tubercles, or cones on it. It is " quadri-tuberculate." The second and the third molars of the upper jaw have three such prominent tubercles (excluding a row of small tubercles on the hinder margin of the second) ; they are, in fact, tri-tuberculate ; whilst the two hindermost molars of the lower jaw have four tubercles and are called quadri-tuberculate. The first molar (M1) of the lower jaw has in this specimen five tubercles. In 60 per cent, of European lower jaws this is the case. But in 40 per cent, this tooth is quadri-tuberculate (see PI. IX). In Polynesians, Chinese, Melanesians and negroes five tubercles are found on this tooth in 90 per cent, of the jaws examined. The apes are characterised by five tubercles on this tooth, and they are found also on the first lower molars of prehistoric men. Four tubercles only on this tooth is a departure from the ape's condition and is found more frequently in Europeans. It is obvious that these big molar teeth, as well as the two smaller ones in front of them on each side of each jaw, are adapted for breaking up rather soft, pulpy food, and not for cutting lumps of bone or raw flesh, as are the molars of the clouded tiger (identical with those of all species of the genus Felis), shown in Figs. 26 and 27, pp. 160,161, nor for rubbing grain, grass or herbage to a paste, as are those of the goat (Fig. 22), those of the coypu rat (Fig. 24), and those of the elephants and mastodons (Fig. 13). PLATE VIII. — Drawings of (i) the upper and (2) the lower series of teeth of the Gibbon (Hylobates concolor\one of the anthropoid or most man-like apes (enlarged by one third). If these drawings are compared with those in PI. VII, showing man's teeth, the most striking difference seen is that the "arch" or series of teeth is here elongated and squared, not rounded in front, whilst there is plenty of room in both jaws for the lasi or wisdom tooth, which is not the case in modern races of men, though in the ancient Neander man's jaw and in that from Heidelberg there is ample space for the last molar as in the apes. The next most important difference is that in the gibbon the four canine teeth are very large and tusk-like, and must certainly be of value as weapons of attack — which man's are not. Connected with the large size of 168 VEGETARIANS AND THEIR TEETH the canines is the presence of a gap (or "diastema" as it is called) between the four front teeth or incisors of the upper jaw and the upper canine — which allows the lower canine to fit in front of the upper canine when the jaw is closed. The number of the tubercles or cones on the molars (the two smaller pre-molars and the three hinder large molars) can be compared in detail in these beautiful drawings from Professor Selenka's work, which are the most careful and perfect which have ever been published. The agreement of these teeth in man and the gibbon is very close : but there are differences. The first, or most anterior premolar of the lower jaw has one predominant cusp or cone ; the second, like both in the upper jaw, is "bicuspid," or bi-tuberculate, as in man. The three big molars of the upper jaw are closely similar to those of man, with some small differences, the second being quadri- tuberculate, whilst in man it is as often tri-tuberculate (as it is in PI. VII) as it is quadri-tuberculate. But the two anterior big molars of the lower jaw are seen to have each five well-marked cones, cusps or tubercles; they are quinqui-tuberculate, whilst in man the first lower molar is often quadri-tuberculate and the second even more frequently so. The last lower molar (wisdom tooth) of the gibbon is like that of man, quadri-tuberculate. The details of the tubercles on these molar teeth distinctly justify the conclusion that they are adapted in the two animals compared — namely, man and the gibbon — to food of the same mechanical quality, and this undoubtedly is fruit and nuts. Nevertheless such a form of tooth is equally well adapted to the texture of cooked meat, which has served many races of man for probably hundreds of thousands of years as food. PLATE IX. left left Kg.l. Kg. 2. OrangOUtan (five tubercles) Fig. 3. Pig.4 Man (fiye tubercles) right left Eg.5. Hg.6. Man (four tubercles) 1 right FIRST LOWER MOLAR. EXPLANATION OF PLATE IX 169 PLATE IX. — The figures in this plate are enlarged drawings of the first lower molar (the first or most anterior of the three big molars as dis- tinct from the bicuspid pre-molars) intended especially to show : (i) That the great East Indian ape, the orang-outan, has five tubercles or cones on this tooth, of which three (numbered I, 2, 3) are on the outer side (away from the tongue), as is seen also in the gibbon (PI. VIII) ; further, that though the lower races of man usually show this monkey-like character (figs. 3 and 4) (seen also in the lower jaw drawn in Plate VIII), yet that frequently in Europeans (in as many cases as 40 out of 100 jaws examined) only four tubercles arefound on this tooth, as shown in figs. 5 and 6. It seems that as compared with primitive man and the " lower" existing races of man, Europeans are tending to a reduction in the number of tubercles on the molar teeth as well as to the " crowding out" or reduction in size and atrophy of the last molar or wisdom-tooth. As compared with the cave-man of the Neander race these differences in the teeth and in the shape and size of the jaw — as well as more important differences in the bony skeleton (dis- covered by Prof. Marcelin Boule, of Paris) — are sufficient to separate the modern European and the Neander cave-man as distinct species of the genus Homo. The teeth in this plate are magnified to 2\ times the linear dimensions of the actual specimens. Figs i and 2 show the curious " wrinkling " of the enamel surface of the tooth in the orang-outan, which is shown by the other molars also in that ape. The figures are copied from Selenka. CHAPTER XII FOOD AND COOKERY A NIMALS, taking one kind with another, nourish