VI CONTENTS 



GusTAFSON, F. G. Comparative studies on respiration. II. 

 The effect of anesthetics and other substances on the respi- 

 ration of Aspergillus niger 181 



Brooks, Matilda Moldenhauer. Comparative studies on 

 respiration. III. The effect of ether on the respiration 

 and growth of Bacillus subtilis 1 93 



Thomas, Helen Stillwell. Comparative studies on respira- 

 tion. IV. The effect of ether on the respiration of wheat . . . 203 



Irwin, Marian. Comparative studies on respiration. V. The 

 effect of ether on the production of carbon dioxide by ani- 

 mals 209 



CoHN, E. J., WoLBACH, S. B., HENDERSON, L. J., and Cathcart, 



p. H. On the control of rope in bread 221 



Parker, G. H. The rate of transmission in the nerve net of the 



ccelenterates 231 



LoEB, Jacques. Amphoteric colloids. II. Volumetric analy- 

 sis of ion-protein compounds; the significance of the isoelec- 

 tric point for the purification of amphoteric colloids 237 



No. 3, January 20, 1919. 



Redfield, Alfred C, and Bright, Elizabeth, M. Tempera- 

 ture coefficient of the action of /3-rays upon the egg of Nereis. 255 



McClure, Charles F. W. On the experimental production of 

 edema in larval and adult Anura 261 



Harvey, E. Newton. Studies on bioluminescence. IX. Chem- 

 ical nature of Cypridina luciferin and Cypridina luciferase . . 269 



Osterhout, W. J. v., and Haas, A. R. C. The temperature co- 

 efficient of photosynthesis 295 



Osterhout, W. J. V. A comparative study of permeability in 



plants 299 



Uhlenhuth, Eduard. Nature of the retarding influence of the 



thymus upon amphibian metamorphosis 305 



Uhlenhuth, Eduard. Parathyroids and calcium metabolism . . 315 



Bovie, W. T., and Hughes, D. M. Rate of recovery from the 



action of fluorite rays 323 



Bovie, W. T., and Klein, Alice. Sensitization to heat due to 



exposure to light of short wave-lengths 331 



