IV CONTENTS 



No. 3 OCTOBER 5 



W. C. Allee. Further studies on physiological states and rheotaxis in 

 Isopoda. Nine figures- 257 



Shinkishi Hatai. The effect of castration, spaying or semi-spaying on the 

 weight of the central nervous system and of the hypophysis of the albino 

 rat; also the effect of semi-spaying on the remaining ovary 296 



Francis B. Sumner. The effects of atmospheric temperature upon the body 

 temperature of mice. Three figures 315 



Jacques Loeb and F. W. Bancroft. Further observations on artificial par- 

 thenogenesis in frogs 379 



No. 4 NOVEMBER 20 



Frank W. Bancroft. Heliotropism, differential sensibility and galvano- 

 tropism in Euglena. Department of Experimental Biology, Rockefeller 

 Institute for Medical Research. Five figures 383 



T. H. Morgan and C. B. Bridges. Dilution effects and bicolorism in cer- 

 tain eye colors of Drosophila. The Zoological Laboratory, Columbia 

 University 429 



Gary N. Calkins and Louise H. Gregory. Variations in the progeny of 

 a single ex-conjugant of Paramecium caudatum. Department of Zool- 

 ogy, Columbia University. Eight diagram figures 467 



R. A. Spaeth. The physiology of the chromatophores of fishes. The Zoo- 

 logical Laboratory of Harvard University. Three text figures and four 

 plates 527 



Calvin B. Bridges. Non-disjunction of the sex chromosomes of Dro- 

 sophila. The Zoological Laboratory, Columbia University 587 



