ay : A et seneoest) y Tri nd rd ee ot oe oor * oy > Serta rt ete t% 5 fe Le LS ~ « KY gta tata md Sop cyt) Wy > 7; ‘gre -9 * oe r Se . - oe ae ad een *. 8. t. & +o iota oe ° 7 +4 ° ~ * #493 - 6,2 .¢ . . 2. Fe — et +4 Oe Oe & - = ae ” > Get J detec otro lt otd vr neve ir ty sath: $ J or Coed ees at Aas 1 +e Sears ye ot 5 Ste i+ ae geet gees aS; se 4 aes aie rare ras ih a grkee ot rt od 3 erste raed) . be Ssockases x : $ bets * Lets red . site *. ae 3 +) Topi ey ee eis erstht: a Ba pserasaei be Tt : + rt yeas: ey set aes aero : eye t eSeeaae age 4 a, Prof te ese + y i ‘ aes, ise i PAN SNOT : we Pee a ib Ky t ee a) Hy ‘ ty ‘i im, in) ¢ fh i) ft sy 1 unt Site. ty eI] ! > Kin) yn) ys" N ‘ Wr ci iy ‘ H) 14 , ony ¥ pei dt SP ah Gin he Naty ae ane i =. Bait Rates May at) Mga Ta alr Wie Rae ATOR het BPE THE JOURNAL OF EXPERIMENTAL ZOOLOGY EDITED BY WiuuiaM HE. CastLe FraNK R. LILLIE Harvard University University of Chicago Epwin G. ConxKLIN Jacques Lors Princeton University Rockefeller Institute Cuar_Les B. DAVENPORT THomas H. Morgan Carnegie Institution Columbia University Horace JAYNE Georce H, PARKER The Wistar Institute Harvard University HERBERT 8. JENNINGS KpMunD B. WItson, Johns Hopkins University Columbia University and Ross G. HARRISON, Yale University Managing Editor VOLUME 14 1913 THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY PHILADELPHIA, PA. ee Net : of bg a Ur eee US i, fas ch Ste he 1 pe ie oe ee THE WAVERLY PRES F BALTIMORE, U. Si 4 . fon 2 ¥ . 0 ah ‘ * 4 a oe CONTENTS 1915 No.1 JANUARY 20 Leon J. Cote. Direction of locomotion of the starfish (Asterias forbesi).. . T. H. More@an anp Evets Cattetu. Additional data for the study of sex- bukediinheritance im Drosoplil a: ..) sc fe ies sk ba Saale ss ee A. H. SrurtevantT. The linear arrangement of six sex-linked factors in Drosophila, as ETHEL NICHOLSON L. B. Nice. Stud shown by their mode of association........................ Browne. Astudy of the male germ cells in Notonecta... . ies on the effects of alcohol, nicotine and caffeine on white mice: tUE Techs ON AGTUVLL yecc.ce ctl others :.chrt too am «8 ees. ceed No.2 FEBRUARY 20 C. M. Curtp. Studies on the dynamics of morphogenesis and inheritance in experimental reproduction. V. The relation between resistance to depressing agents and rate of metabolism in Planaria dorotocephala and its value.as a method of investigation. 0... 022 oe elena cesses Be ees ~V. E. SHetForD anp W. C. Auuer. The reactions of fishes to. gradients of dissolved atz MOBPHETIC SASESs:.. Wea Re Aen es eh ete ee ae JaceuEs Logs anp F. W. Bancrort. The sex of a parthenogenetic tadpole and frog....=.. FRANK D. Lutz. wing length of Drosophila ampelophial..« <3 aguas seeam oc net : H. S. JENNINGS. Experiments concerning the sexual difference in the No.3 APRIL 5 The effect of conjugation in paramecium. Two figures..... v! H. 8S. Jennines anp K. 8. Lasuitey. Biparental inheritance and the ques- tion of sexuality in paramecium. Two figures..................0--.0005 ALFRED O. Gross. No. 4 MAY 20 The reactions of arthropods to monochromatic lights of equal intensities. Forty-five figures..:..2......<...6..c05 cses ceecees ‘ FRANK R. LILLIE. Studies of fertilization. V. The behavior of the sperma- tozoa of Nereis and Arbacia with special reference to egg-extractives. JE Ge 151-9 001s eee OPM RR st gt aie Ct ea 515 LoranpDE Loss Wooprurr. The effect of excretion products of Infusoria on the same and on different species, with special reference to the proto- ZORMSCGUCNCEANUNLUSIONSS ..ck, cass Acia eet totes oe Bebe yee bona Een EOL | 279 393 467 Bert : rae gis aia ey % ? ‘hs nm mi eke ba = ume. Cie Taos i Fah Seige O04 ie 2h t FS Avene ne ae gentios ee " lone: | re) Lone Via: tb ih oe ee M 7 ri rd FRE 3 $ veer Wet . i yal 9 ot , : a Bees - “43 1 ere 7 oa A : a j . ” a . ag oly ge Mae ae “Wy yo ee Sas sasuke ‘he \ Loe Yi. te “oale eat i og Crs Fee a 7 i May id Pan q : ss -SNak uw ea) med i) An) i rau DIRECTION OF LOCOMOTION OF THE STARFISH (ASTERIAS FORBESD! LEON J. COLE College of Agriculture, University of Wisconsin, Madison, Wis. NINE FIGURES CONTENTS Algal aWaeys hb Kein Cova jen ie POOR ee tees Behar one ocirerein a. noire Praia Daa os, 5 1 DeeiVaterial-ancdeme thodsis 02 erie eee ete teest tere aa eerste eee nents a 3 TherMethod: of locomotion yn.e ca oe eee eee ome ee sae ee cra 6 DV. Wxperimentall resultscs0 a5 op tes cee pg teens okies toh ia te 8 Le eDirectionvot locomovloniaes+. 6 om eee eee cee et eee 8 2. Relation of direction of locomotion to length of arm............. 12 3. Persistence Of therm pulse. ya. cra: a aciereie thee etree nr irs a 16 A Rotation: Of therm pulses... oats oc gers oe euuetaytal yaad oer Perey ete 17 5. Relation of arms used in righting to direction of locomotion..... 19 V. Comparison with other echinoderms.............---2+.+s+-+2-eeeres: 23 1. Preyer’s experiments on starfishess...20...2...< fee.:2see een eee: 24 o- Hichinoids and other echinoderms: es. 1.1 seis - se el eee oir 26 Wile Conclude discussions .:..\en Homad,c soe ie eee eine