THE LIBRARY OF THE UNIVERSITY OF CALIFORNIA PRESENTED BY PROF. CHARLES A. KOFOID AND MRS. PRUDENCE W. KOFOID THE BRITISH NATURALIST. SPRING— SUMMER. (Summer. LONDON : WHITTAKER, TREACHER, AND ARNOT, AVE-MARIA LANE. MDCCCXXX. BRITISH NATURALIST; OR, SKETCHES OF THE MORE INTERESTING PRODUCTIONS OF BRITAIN AND THE SURROUNDING SEA, IN THE SCENES WHICH THEY INHABIT ; AND WITH RELATION TO THE GENERAL ECONOMY OF NATURE, AND THE WISDOM AND POWER OF ITS AUTHOR. VOLUME SECOND. THE YEAR-SPRING, SUMMER. Nature speaks A parent's language, and, intones as mild As e'er hush'd infant on its mother's breast, Wins us to learn her lore ! Professor Wilson's Poems, LONDON : PRINTED FOR WHITTAKER, TREACHER, AND Co. AVE-MARIA LANE. MDCCCXXX. BRADBURY AND EVANS, PRINTERS, 1, DOUVERIE STREET. PREFACE. THE favourable reception of the first volume of " the British Naturalist," has convinced the author that the plan, which he has attempted, of repre- senting the works of creation in their natural groupes, is far from the least interesting ; and it is certainly the best and, perhaps, the only way of making the pages of a written book have some resemblance to those of the book of nature, and thus rendering the transition from the closet to the field, a transition in degree only, and not one in kind, as it necessarily is when the plant or the animal, of which the written account has been studied, is found surrounded with other subjects, all of which are unknown, and, as novelties, really have the most attraction. M34S974 IV PREFACE. But in a climate so variable as that of Britain, changes of season are attended with as much difference in the appearances and habits of natural objects as changes of scene ; and, therefore, in- stead of introducing the subject in detached parts, it has been thought better to give, in this volume, a very slight general glance at the natural history of the year, as affected by the motions of the earth and the changing actions of the sun and moon. That part of the subject is not very easily treated, without more technicality than is consistent with the plan of a work, the express objects of which are plainness and simplicity. But it is hoped that, with the assistance of the plate and the explanation, the subject will not be wholly un- intelligible to those who are not conversant with descriptive and physical astronomy ; and those who are so conversant, will readily find an excuse for the imperfection of a little sketch of that, which they themselves must have learned through the study of many profound and elaborate volumes. From their greater powers of locomotion, the birds are the best animated indexes to the seasons, and, therefore, more space has been given to them PREFACE. than to any of the other productions; though some hints respecting other subjects will be found, wherever it was judged that they could be in- troduced to advantage. On a few points, too, there is a departure from the opinions of some of the authorities ; but there the author would be understood not to assert, but respectfully to recom- mend further observation — as of matters that are but imperfectly understood. Although the abilities of the author were in ac- cordance with his wish, he is well aware that no writing can do more than operate as an excite- ment to the study of Nature itself; and if what the author of "The British Naturalist" has written, or may write, shall have that effect, he will feel that he has accomplished all that he can accom- plish in kind; and it is for the public to judge of the accomplishment in degree. Bank of the Thames, June, 1830. EXPLANATION TO THE PLATE OF THE SEASONS AND TIDES. Fig. l. Is a representation of the earth's orbit, as it would appear to a spectator, at an infinite distance perpendicularly over the centre. The horizontal line across the centre is the solstitial diameter, the winter sol- stice to the northern hemisphere being at the left hand, and the summer solstice at the right. Of course the vernal equinox is at the bottom, and the autumnal at the top. The vertical line passing through S, (the place of the sun), is the equinoctial diameter of the orbit, f is the other focus of the ellipse ; the small space, from S to f, is the focal distance, or twice the eccentricity ; and the longest diameter that could be drawn per- pendicularly to the solstitial one would be half way between S and f. Upon the supposition that the sun is at rest, the form of the orbit will be very nearly that of the figure j but as we do not know anything about rest or motion in absolute space, and as the sun may have a motion of many hundred millions of miles in a year, or even in a day, or an hour, we know not the form of the orbit in any other way than with reference to the sun. The head of a nail in a coach wheel performs a motion in a circular orbit round the axle ; but, as the coach rolls on, sometimes on a level, sometimes up hill, and sometimes down, sometimes straight forward, sometimes curving to the right, and sometimes to the left, the path of the nail, with regard to the earth, is very different, and could not possibly be represented on a flat surface. If the road were straight forward, the path of the nail would be a series of cycloids, having their terminations at the points where the nail came in contact with the road, and the path would be something like this— there being as many loops or cycloids upward as revolutions of the wheel. Mil EXPLANATION. When we speak about the celestial bodies as revolving in ellipses, we must always bear in mind that this applies only to the revolving body, and the centre round which it revolves, just as we speak of the nail in the coach wheel revolving in a circle round the axle ; for any motion of the centre will give a new form to the path of the revolving body, in absolute space. We have an instance of that in the moon, which, in the course of the year, will describe as many loops as there are lunations; and, as the paths of the earth and moon, with regard to their respective centres of revolution, are both ellipses, those loops will constantly vary in form. The globes upon which the meridians and parallels are drawn, represent the earth,— out of all proportion to the orbit of course, for as the diameter of the earth is only about one twenty-five thousandth part of that of the orbit, an orbit, in proportion to the earth in the figure, would have re- quired a diameter of a thousand feet j and an earth in proportion to the orbit, would have had only a diameter of the twelve thousandth part of an inch, and would not have been visible. The earth in the four positions is placed with the axes parallel, but making an angle of 23£° with the plane of the orbit, inclined from the sun at the left hand, to the sun at the rightj and inclined to the left hand, but not either to the sun or from the sun, at the top and bottom. The half next the sun is left unshaded to show the light, and the opposite half is shaded to show the darkness at all the positions. The point where the meridians meet, is the north pole. The small circle round it is the Arctic polar circle ; the next one the northern tropic $ and the circle of which only a part is seen is the equator. Thus the figure, in each of the positions, represents the same half of the earth's surface, — namely, the whole of the northern polar zone, the whole of the northern temperate zone, three-fourths of the northern half of the torrid zone, and one-fourth of the southern. The meridians on the globes are hours asunder j twelve mid-day being always nearest the sun, the six o'clocks equally distant, and twelve mid- night the most remote. The number of hours of sunshine or darkness, at any latitude and any season, may be estimated by noticing how many of hour lines are light and how many dark j for instance, ten hours of the northern tropic are illuminated at the winter solstice, and fourteen at the summer, and twelve of every latitude of the equinoxes. The dotted circle outside the earth's orbit, is merely a mark in space, to represent the plane of the orbit as produced to the regions of the stars. The globes are at the commencement of the signs for the beginning of the quarters ; the other commencements are at the small lines across the dotted circle ; and the usual marks are put for the signs themselves. But EXPLANATION. IX as, in common language, we associate the signs with the months in a re- verse order, they are reversed) ^should really be where