vi CONTENTS 



OsTERHOUT, W. J. V. A theory of injury and recovery. I. Ex- 

 periments with pure salts 145 



Maxwell, S. S. Labyrinth and equilibrium. III. The mechan- 

 ism of the static functions of the labyrinth , 157 



Garrey, Walter E. The action of inhibitory nerves on carbon 



dioxide production in the heart ganglion of Limulus 163 



Brooks, S. C. The kinetics of inactivation of comiplement by 



light 169 



Brooks, S. C. The mechanism of complement action 185 



Irwin, Marian. Comparative studies on respiration. Xlll. 

 An apparatus for measuring the production of minute quan- 

 tities of carbon dioxide by organisms 203 



Krafka, Joseph, Jr. Environmental factors other than tem- 

 perature affecting facet number in the bar-eyed mutant of 

 Drosopl/ila 207 



Northrop, John H. The significance of the hydrogen ion con- 

 centration for the digestion of proteins by pepsin 211 



Loeb, Robert F. Radioactivity and physiological action of 

 potassium 229 



Loeb, Jacques. Chemical character and physiological action 



of the potassium ion 237 



Loeb, Jacques. Ion series and the physical properties of pro- 

 teins. II 247 



No. 3, January 20, 1921. 



P:^ZARD, A. Numerical law of regression of certain secondary sex 

 characters 271 



Hecht, Selig. Photochemistry of visual purple. II. The effect 



of temperature on the bleaching of visual purple by light .... 285 



EcKWEiLER, Herbert, Noyes, Helen Miller, and Falk, K. 

 George. The amphoteric properties of some amino-acids 

 and peptides 291 



Coulter, Calvin B. The isoelectric point of red blood cells and 



its relation to agglutination 309 



Zoller, Harper F., and Clark, W. Mansfield. The produc- 

 tion of volatile fatty acids by bacteria of the dysentery 

 group 325 



