IV CONTENTS OF VOLUME XLVIII. 



GREGORY, LOUISE H. Direct and After Effects of Changes in 

 Medium During Different Periods in the Life History of 

 Uroleplus mobilis 200 



WILLIS, JOSEPHINE A. Effects of Carbon Dioxide 209 



No. 4. APRIL, 1925. 



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

 of Crayfishes: II. Females of Cambarus virilis with Male 



Secondary Sexual Characters 225 



///. Males with Supernumerary Male Secondary Sexual 

 Characters in the Subgemis Faxonius 232 



EDWARDS, J. GRAHAM. Formation of Food-cups in Amoeba 



Induced by Chemicals 236 



CHAMBERS, ROBERT, AND DAWSON, J. A. The Structure of 



the Undulating Membrane in the Ciliate Blepharisma . . . 240 



RICHARDS, MILDRED H., AND FURROW, ESTHER Y. The Eye 



and Optic Tract in Normal and "Eyeless" Drosophila . . . 243 

 CALDWELL, G. T. A Reconnaissance of the Relation Bet-ween 



Desiccation and Carbon Dioxide Production in Animals. 259 



DOBROSCKY, IRENE D. External Parasites of Birds and the 



Fauna of Birds' Nests 274 



CLEVELAND, L. R. The Method by Which Trichonymphia 

 campanula, a Protozoon in the Intestine of Termites, 



Ingests Solid Particles of Wood for Food 282 



The Ability of Termites to Live Perhaps Indefinitely on a 

 Diet of Pure Cellulose 289 



No. 5. MAY, 1925. 



* CLEVELAND, L. R. The Feeding Habit of Termite Castes and 



its Relation to their Intestinal Flagellates 295 



The Effects of Oxygenation and Starvation on the Symbi- 

 osis Between the Termite, Termopsis, and its Intestinal 

 Flagellates 309 



ADOLPH, EDWARD F. Some Physiological Distinctions Be- 

 tween Freshwater and Marine Organisms 327 



SPEIDEL, C. C. Endocrine Glands and Bilateral Symmetry: 

 Observations upon For climb Emotion in I'rog Larvae 

 under Treatment with Thyroid and Thymus Extracts. . . . 336 



SMITH, HARVEY M. Cell .S'/cr and Metabolic Activity in 



Amphibia 347 



