CONTENTS 
No. 1. FEBRUARY 
Auicre M. Bortne AND RayMonpD PEARL. Sex studies. XI. Hermaphrodite 
birds.) Nine text figuressandenine plates. =... J.tetcs so. see eee = 
Rogsert StantEY McEwen. The reactions to light and to gravity in Droso- 
philagand its mutantseeebnree fpures! 2 o-is2.. 2. qe meric ges selene tetas 
C. V. Morrity. Some experiments on regeneration after exarticulation in 
Diemyctylus viridescens. Ten figures (three plates)................... 
Epvuarp Usuenuutn. Is the influence of thymus feeding upon develop- 
ment, metamorphosis and growth due to a specific action of that gland? 
J. M.D. Oumstep. The regeneration of triangular pieces of Planaria macu- 
lata: Avstudysin:polarity.. Fourteen: figures... .. 2-22 det. 05 gece opens 
Manton Corpetanp. The olfactory reactions of the marine snails Alectrion 
obsoleta (Say) and Busycon canaliculatum (Linn.).................... 
Sexic Hecut. The physiology of Ascidia atra Lesueur. I. General physi- 
Olo py APU Cenet UTES hc. sire tree tare ai eg RNs ep ave Seacoast gers oe 
Seria Hecut. The physiology of Ascidia atra Lesueur. II. Sensory physi- 
LO my enor HPULE Ba. © oc ies aie, <3. 2,0,8 6s ele otoea ea atone aacapetol> etete otnw a, Re ears 
INOsg2. eee wets 
Cuester A. STEWART. Changes in the relative weights of the various parts, 
systems and organs of young albino rats underfed for various periods. 
(CYNE: Thea Tiel e S aas ecctea cece BG SN Ven Sans Ss Cover SAR Aerts See oa 
Expon W. Sanrorp. Experiments on the physiology of digestion in the 
Blatihidvess lowenty-oneslouresn... 10s sscncs aoa am oe de care ae era 
Ross G. Harrison. Experiments on the development of the fore limb of 
Amblystoma, a self-differentiating equipotential system. Forty-five 
OrREN Lioyp-JoNES AND F. A. Hays. The influence of excessive sexual ac- 
tivity of male rabbits. I. On the properties of the seminal discharge. . 
S. R. DetwiterR. Experiments on the development of the shoulder girdle 
and the anterior limb of Amblystoma punctatum. Thirty-three figures. 
P. W. Wurrtine. Inheritance of coat-color in cats. Two plates (eight 
fT UTES): ety eR PE er Aare ME Pn Ar ales ste ncrs lieu evcts ck do Tavera a eterauetors 
Frank A. Hays. The influence of excessive sexual activity of male rab- 
bits. II. On the nature of their offspring. Twenty-two charts....... 
301 
355 
