IV COMI-AI^ <>F VOLUME XI. VI 



No. 5. MAY, i (^4 



CLEVELAND, L. R. The Physiological and Symbiotic Rela- 

 tionships between the Intestinal Protozoa of Termites and 

 their Host, with Special Reference to Reticnlitermes 

 flavipes Kollar 203 



KINDRED, JAMES E. The Cellular Elements in the Peri- 

 visceral Fluid of Echinoderms 228 



GOODRICH, HUBERT E. Cell Behavior in Tissue Cultures.. 252 



No. 6. JUNE, 1924 



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

 of Crayfishes, i. Male Secondary Sexual Characters 

 in females of Cambarus propinquus 263 



HEILBRUNN, L. Y. The Surface Tension Theory of Mem- 

 brane Elevation 277 



HOADLEY, LEIGH. The Independent Differentiation of Iso- 

 lated Chick Priniordia in Chorio-allantoic Grafts 281 



MANX, MARGARET C. Cytological Changes in Unfertilized 



Tubal Eggs of the Rat 316 



