CONTENTS. 



No. 1, September 20, 1920. 



PAGE 



Hecht, Selig. Photochemistry of visual purple. I. The kinetics 



of the decomposition of visual purple by light 1 



Osterhout, W. J. V. The mechanism of injury and recovery ... 15 



Smith, Theobald, and Smith, Dorothea E. Inhibitory action 

 of paratyphoid bacilli on the fermentation of lactose by 

 Bacillus coli. 1 21 



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

 A comparison of the production of carbon dioxide by Penicil- 

 lium and by a solution of dextrose and hydrogen peroxide ... 35 



Garrey, Walter E. Dynamics of nerve cells. I. The tempera- 

 ture coefficient of the neurogenic rhythm of the heart of 

 Limulus polyphemus 41 



Garrey, Walter E. Dynamics of nerve cells. II. The tem- 

 perature coefficients of carbon dioxide production by the 

 heart ganglion of Limulus polyphemus 49 



Crozier, W. J. On the role of an integumentary pigment in 



photoreception in Holothuria 57 



Carey, Eben J. Studies in the dynamics of histogenesis. II. 

 Tension of differential growth as a stimulus to myogenesis 

 in the esophagus 61 



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

 teins. 1 85 



Lillie, Ralph S. The recovery of transmissivity in passive 

 iron wires as a model of recovery processes in irritable living 

 systems. Part 1 107 



No. 2, November 20, 1920. 



Lillie, Ralph S. The recovery of transmissivity in passive iron 

 wires as a model of recovery processes in irritable living 

 systems. Part II 129 



