viii CONTENTS 



Brooks, Matilda Moldenhauer. Comparative studies on 

 respiration. XV. The effect of bile salts and of saponin 

 upon respiration 527 



Inman, O. L. Comparative studies on respiration. XVI. 

 Effects of hypotonic and hypertonic solutions upon res- 

 piration 533 



LoEB, Jacques. Further observations on the production of 



parthenogenetic frogs 539 



LoEB, Jacques. Chemical and physical behavior of casein 

 solutions 547 



Loeb, Jacques. Colloidal behavior of proteins 557 



No. 5, May 20, 1921. 



Fox, H. MuNROE. Methods of studying the respiratory ex- 

 change in small aquatic organisms, with particular reference 

 to the use of flagellates as an indicator for oxygen con- 

 sumption 565 



Fenn, Wallace O. The phagocytosis of solid particles. III. 



Carbon and quartz 575 



Falk, K. George, and McGuire, Grace. Studies on enzyme 



action. XIX. The sucrolytic actions of bananas 595 



OsTERHOUT, W. J. V. A theory of injury and recovery. III. 



Repeated exposures to toxic solutions 611 



Brody, Samuel, and Ragsdale, Arthur C. The rate of 



growth of the dairy cow. Extrauterine growth in weight. . 623 



ZoLLER, Harper F. Casein viscosity studies 635 



Baas-Becking, Lourens G. M. The significance of latency 



time in enzyme determination 653 



Sherman, James M., and Shaw, Roscoe H. Associative bac- 

 terial action in the propionic acid fermentation 657 



Krafka, Joseph, Jr. The physiological zero: An explanation of 

 the departure from the linear graph of the reaction rate 

 values at the lower temperatures 659 



Inman, O. L. Comparative studies on respiration. XVII. 



Decreased respiration and recovery 663 



