CONTENTS 



Northrop, John H. The influence of the substrate concentration 



on the rate of hydrolysis of proteins by pepsin 595 



ScHMiTZ, Henry. Enzyme action in Echinodontium tinctorium Ellis 



and Everhart 613 



GusTAPSON, F. G. Comparative studies on respiration. XI. The 

 effect of hydrogen ion concentration on the respiration of Peni- 

 cillium chrysogenum 617 



Crozier, W. J. The analysis of neuromuscular mechanisms in 



Chiton 627 



Hampton, Harold Clark, and Baas-Becking, Lourens G. M. 

 The kinetics of the action of catalase extract from marine algae, 

 with a note on oxidase 635 



LoEB, Jacques. Quantitative laws in regeneration. II 651 



LoEB, Jacques. The reversal of the sign of the charge of collodion 



membranes by trivalent cations 659 



LoEB, Jacques. Ionic radius and ionic efl&ciency 673 



Index to Volume II 689 



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