CONTENTS 



Harvey, E. Newton. Studies on bioluminescence. VII. Reversi- 

 bility of the photogenic reaction in Cypridina 133 



Hecht, Selig. The photic sensitivity of Ciona intestinalis 147 



OsTERHOUT, W. J. V. An indicator method of measuring the con- 

 sumption of oxygen 167 



OsTERHOUT, W. J. V. Comparative studies on respiration. I. In- 

 troduction 171 



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

 efifect of anesthetics and other substances on the respiration of 

 Aspergillus niger 181 



Brooks, Matilda Moldenhauer. Comparative studies on respira- 

 tion. III. The efifect of ether on the respiration and growth of 

 Bacillus'juhtilis 193 



Thomas, Helen Stillwell. Comparative studies on respiration. 



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 animals . 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 analysis of 

 ion-protein compounds; the significance of the isoelectric point 

 for the purification of amphoteric colloids 237 



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