INDEX 



561 



Reproduction. VIII. Dynamic factors in 

 head-determination in Planaria. Studies 

 on the dynamics of morphogenesis and 

 inheritance in experimental 61 



Resorption in the food vacuole, and further 

 analysis of the process of extrusion. The 

 relations of Busaria to food. II. Diges- 

 tion and 1 



SECTION, or removal of tlic oviduct. 

 Studies on the physiolog.\- of reproduc- 

 tion in the domestic fowl. VIII. On 

 some physiological effects of ligation .... 395 

 Senta. The influence of food in controlling 



sex in Hydatina 545 



Sex in Hydatina senta. The influence of food 



in controlling 545 



Sex-linked lethal factor in Drosophila. A 



third 315 



Sex-linked lethal factors in Drosophila and 



their influence on the sex-ratio. Two. . . 81 

 Sex-ratio. Two sex-linked lethal factors in 



Drosophila and their influence on the. ... 81 

 Shumway, Waldo. The effect of thyroid on 



the division rate of Paramaecium 297 



Solid structures. The reaction of embrj'onic 



cells to 521 



Spermatocyte cells of Notonecta, with special 



reference to the mitochondria. The effects 



of centrifuging the 337 



Spermatozoa caused l).v specific substances 

 from eggs. Cluster formation of 123 



.Sterility in Drosophila ampelophila. I. Ster- 

 ilit.v in Drosophila with especial reference 

 to a defect in the female and its behavior 

 in heredity. Fertility and 141 



. II. Fertility in Drosophila and its 



behavior in heredity. Fertility and 173 



. III. Effects of crossing on fertility in 



Drosophila. IV'. Effects on fertility of 

 crossing within and without an inconstant 

 stock of Drosophila. Fertility and 343 



THYROID on the division rate of Para- 

 maecium. The effect of 297 



V 



ACUOLE, andfurtheranalysisof the proc- 

 ess of extrusion. The relations of Bur- 

 saria to food. II. Digestion and resorp- 

 tion in the food 1 



WHITNEY, David D. The influence of 

 food in controlling sex in Hydatina 



senta 545 



Woodruff, Lorande Loss, and Erdm.vxn, 

 Rhoda. a normal periodic reorganization 

 process without cell fu.sion in Paramae- 

 cium 425 



