IV CONTENTS OF VOLUME XLIX. 



HEILBRUNN, L. V. Studies in Artificial Parthenogenesis, V.. 241 

 KOEHRING, VERA. The Spermatheca of Eurycea bislineata . . 250 

 BREITENBECHER, J. K. The Inheritance of a Macula Muta- 

 tion Concerned with Elytral Spotting and Latent Traits in 



the Male of Bruchus 265 



TORREY, HARRY BEAL, AND HORNING, BENJAMIN. The 

 Effect of Thyroid Feeding on the Moulting Process and 



Feather Structure of the Domestic Fowl 275 



HYMAN, L. H. On the Action of Certain Substances on 



Oxygen Consumption 288 



No. 5. NOVEMBER, 1925. 



HOLMES, FRANCIS O. The Relation of Herpetomonas elmas- 



siani (Migone) to its Plant and Insect Hosts 323 



ROGERS, CHARLES G., AND COLE, KENNETH S. Heat Pro- 

 duction by the Eggs ofArbacia punctulata during Fertiliza- 

 tion and Early Cleavage 338 



McEwEN, ROBERT S. Concerning the Relative Phototropism 



of Vestigial and Wild Type Drosophila 354 



TORREY, HARRY BEAL, AND HORNING, BENJAMIN. Thyroid 

 Feeding and Secondary Sex Characters in Rhode Island 

 Red Chicks 365 



TURNER, C. L. Studies on the Secondary Sexual Characters 

 of Crayfishes, IV. Males with Two Sets of Super- 

 numerary Male Characters 375 



TURNER, C. L. Studies on the Secondary Sexual Characters 



of Crayfishes, V. Males with Female Characters 379 



FINK, DAVID E. Physiological Studies on Hibernation in 



the Potato Beetle, Leptinotarsa decemlineata Say 381 



No. 6. DECEMBER, 1925. 



BOSCHMA, H. On the Feeding Reactions and Digestion in 

 the Coral Polyp Astrangia danas, with Notes on its Sym- 

 biosis with Zooxanthellae 407 



CLARE, M. R. A Study of Oxygen Metabolism in Drosophila 



melanogaster 440 



HEILBRUNN, L. V. The Action of Ether on Protoplasm. . . . 461 



