CONTENTS. 

 No. 1, September 20, 1919. 



PAGB 



OsTERHOUT, W. J. V. Comparative studies on respiration. VII. 



Respiration and antagonism. Introductory note 1 



Brooks, Matilda Moldenhauer. Comparative studies on 

 respiration. VIII. The respiration of Bacillus suUilis in 

 relation to antagonism 5 



Gustafson, F. G. Comparative studies on respiration. IX. 

 The effects of antagonistic salts on the respiration of 

 Aspergillus niger 17 



Redfield, Alfred C, and Bright, Elizabeth M. The rela- 

 tive physiological effects of /3- and 7-rays upon the egg of 

 Nereis 25 



Redfield, Alfred C, and Bright, Elizabeth M. The relative 

 physiological effects of /S-rays of different velocities 31 



Chambers, Robert. Changes in protoplasmic consistency and 



their relation to cell division 49 



Zeleny, Charles. A change in the bar gene of Drosophila 

 involving further decrease in facet number and increase 

 in dominance 69 



Gaskell, J. F. Adrenalin in annelids. A contribution to the 

 comparative study of the origin of the sympathetic and the 

 adrenalin-secreting systems and of the vascular muscles 

 which they regulate 73 



LoEB, Jacques. Electrification of water and osmotic pressure. 87 



No. 2, November 20, 1919. 



Crozier, W. J., and Arey, L. B. The heliotropism of Onchid- 

 ium: a problem in the analysis of animal conduct 107 



Northrop, John H. The combination of enzyme and sub- 

 strate. I. A method for the quantitative determination 

 of pepsin. II. The effect of the hydrogen ion concentration. 113 



V 



