CONTENTS 



No. 1. MAY 



Helen Dean King. Studies on inbreeding. I. The effects in inbreeding on 

 the growth and variability in the body weight of the albino rat. Four- 

 teen charts 1 



P. W. Whiting and Helen Dean King. Ruby-eyed dilute gray, a third 



allelomorph in the albino series of the rat 55 



M. F. Guyer and E. a. Smith. Studies on cytolysins. I. Some prenatal 



effects of lens antibodies 65 



William A. Kepner and Arnold Rich. Reactions of the proboscis of 



Planaria albissima Vejdovsky. Ten figures 83 



S. Hatai. On several effects of feeding small quantities of Sudan III to young 

 albino rats. Three charts 101 



Charles R. Stockard and George N. Papanicolaou. Further studies on 

 the modification of the germ-cells in mammals : The effect of alcohol on 

 treated guinea-pigs and their descendants. Nine tables and nine figures . . 119 



No. 2. JULY 



Oscar Riddle. A demonstration of the origin of two pairs of female identi- 

 cal twins from two ova of high storage metabolism . Thirteen tables 227 



B. W. KuNKEL. The effects of the ductless glands on the development of the 

 flesh flies 255 



Mario Garcia-Bands. Is the theory of axial gradient in the regenerati9n of 



tubularia supported by facts? 265 



Alfred C. Redfield. The physiology of the melanophores of the horned 



toad Phrynosoma. Eight text figures and five plates 275 



Helen Dean King. Studies on inbreeding. II. The effects of inbreeding 

 on the fertility and on the constitutional vigor of the albino rat. Two 

 charts 335 



W. J. Crozier. The amount of bottom material ingested by holothurians 



(Stichopus) . Two charts 379 



No. 3. AUGUST 



H. H. Newman. Hybrids between Fundulus and mackerel. A study of 

 paternal heredity in heterogenic hybrids. Four figures. 391 



W. C. Allee and E. R. Stein, Jr. Light reactions and metabolism in May- 

 fly nymphs. I. Reversals of phototaxis and the resistance to potassium 

 cyanide. II. Reversals of phototaxis and carbon dioxide production. 

 Four charts 423 



iii 



