CONTENTS 



Moore, A. R. The action of strychnine and nicotine on the neuro- 

 muscular mechanism of Asterias 201 



Parmenter, Charles L. The chromosomes of parthenogenetic frogs. 205 



Harvey, E. Newton. Studies on bioluminescence. XII. The action 

 of acid and of Hght in the reduction of Cypridina oxyluciferin. . 207 



McGuiRE, Grace, and Falk, K. George. Studies on enzyme action. 

 XVIII. The saccharogenic actions of potato juice 215 



Hecht, Selig. The photochemical nature of the photosensory 

 process 229 



LiNHART, George A. The free energy of biological processes. Pre- 

 liminary paper 247 



Harvey, R. B. Apparatus for measurement of oxidase and catalase 

 activity 253 



LoEB, Jacques. Influence of a sUght modification of the collodion 

 membrane on the sign of the electrification of water 255 



LoEB, Jacques. Influence of the concentration of electrolytes on 

 some physical properties of colloids and of crystalloids 273 



Loeb, Jacques. Quantitative laws in regeneration. 1 297 



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