CONTENTS 



No. 1. JANUARY 



Mary Jane Hogue. A comparison of an amoeba, Vahlkampfia patuxent, 

 with tissue-culture cells. Three figures 1 



Theophiltts S. Painter. Studies in mammalian spermatogenesis. I. The 

 spermatogenesis of the opossum (Didelphys virginiana). Eight text 

 figures and three plates (twenty figures) 13 



Joseph Hall Bodine. The effect of light and decapitation on the rate of CO2 



output of certain Orthoptera. Three figures 47 



DwiGHT E. MiNNiCH. The chemical sensitivity of the tarsi of the red admiral 

 butterfly Pyrameis atalanta Linn. Three figures 57 



No. 2. FEBRUARY 



Ann Haven Morgan. The temperature senses in the frog's skin. One 

 figure 83 



S. R. Detwiler. Experiments on the transplantation of limbs in Ambly- 

 stoma. Further observations on peripheral nerve connections. Thirty- 

 two figures 115 



H. L. WiEMAN. The effect of transplanting a portion of the neural tube of 

 Amblystoma to a position at right angles to the normal. Eighteen 

 figures 163 



LoRANDE Loss WooDRUFF AND HoPE Spencer. Studies on Spathidium 

 spathula. I. The structure and behavior of Spathidium, with special 

 reference to the capture and ingestion of its prey. Eight text figures 

 and one plate (figures nine to twenty) 189 



M. F. GuYER. Studies on cytolysins. III. Experiments with spermato- 



toxins. One figure 207 



Bessie Noyes. Experimental studies on the life history of a rotifer repro- 

 ducing parthenogenetically (Proales decipiens) 225 



No. 3. APRIL 



J. S. Nicholas. The reactions of Amblystoma tigrinum to olfactory stimuli. 



One figure 257 



A. Franklin Shull. Relative nuclear volume and the life-cycle of Hydatina 



senta. One figure 283 



Joseph Hall Bodine. Anesthetics and CO2 output. I. The effect of 



anesthetics and other substances on the production of carbon dioxide 



by certain Orthoptera. Five figures 323 



H. C. VAN der Heyde. On the respiration of Dytiscus marginalis L. Three 



figures 335 



111 



\ 1 XM- V 



