CONTENTS 



Northrop, John H. The inactivation of trypsin. 1 227 



Northrop, John H. The inactivation of trypsin. II. The equilib- 

 rium between tr)rpsin and the inhibiting substance formed by its 

 action on proteins 245 



Northrop, John H. The inactivation of trypsin. III. Spontaneous 

 inactivation 261 



Osterhout, W. J. V. Direct and indirect determinations of permea- 

 bility 275 



Harvey, E. Newton. Studies on bioluminescence. XIV. The 



specificity of luciferin and luciferase 285 



Redfield, Alfred C, and Bright, Elizabeth M. The effects of 



radium rays on metabolism and growth in seeds 297 



Crozier, W. J. Correspondence of skin pigments in related species 

 of nudibranchs 303 



Powers, Edwin B. The physiology of the respiration of fishes in rela- 

 tion to the hydrogen ion concentration of the medium 305 



Uhlenhuth, Eduard. The effect of iodine and iodothyrin on the 

 larvae of salamanders. IV. The role of iodine in the inhibition of 

 the metamorphosis of thymus-fed salamanders 319 



Uhlenhuth, Eduard. The influence of feeding the anterior lobe of 



the hypophysis on the size of Amby stoma tigrinum 321 



Fenn, Wallace O. The temperature coefficient of phagocytosis 331 



Brooks, Matilda Moldenhauer. The penetration of cations into 

 Hving cells 347 



Loeb, Jacques. The origin of the electrical charges of colloidal 

 particles and of hving tissues 351 



The Journal of General Physiology is issued bimonthly, one volume of about 600 

 pages appearing in a year. Contributions should be sent to the editors of The Journal 

 of General Physiology, Avenue A and 66th Street, New York, N. Y., or 60 Buckingham 

 Street, Cambridge, Mass. The papers should be limited preferably to twenty printed 

 pages, not counting the space occupied by illustrations. Authors receive 100 reprints 

 of their papers free of charge; additional copies may be obtained at cost. 



The subscription price per year (one volume) is $5.00, payable in advance. Single 

 copies cost $1.00. Remittances should be made by draft or check on New York, or by 

 postal money order, payable to The Journal of General Physiology, Mount Royal and 

 Guilford Avenues, Baltimore, Md., or Avenue A and 66th Street, New York, N. Y. 



