Vi CONTENTS 



Smith, Edith Philip. Comparative studies on respiration. 



XIX. Apreliminary stage in the progress of ether anesthesia.. 157 



Moore, A. R. Stereotropic orientation of the tube feet of starfish 



(Asterias) and its inhibition by light 163 



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



The cause of partial recovery 171 



Brooks, Matilda Moldenhauer. The effect of hydrogen ion 

 concentration on the production of carbon dioxide by 

 Bacillus hutyricus and Bacillus subtilis 177 



LoEB, Jacques, and Loeb, Robert F. The influence of electro- 

 lytes on the solution and precipitation of casein and gelatin . . 187 



Loeb, Jacques. The origin of the potential differences respon- 

 sible for anomalous osmosis 213 



No. 3, January 20, 1922. 



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



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

 librium between trypsin and the inhibiting substance formed 

 by its action on proteins 245 



Northrop, John H. The inactivation of trypsin. III. Spon- 

 taneous inactivation 261 



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



perm.eability 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 



relation 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 inhibi- 

 tion 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 0. The temperature coefficient of phagocytosis. 331 



