AUTHORS 



691 



N 



Northrop, John H. The combina- 

 tion of enzyme and substrate, I. 

 . A method for the quantitative 

 determination of pepsin. II. 

 The effect of the hydrogen ion 

 concentration, 113 



— . Concerning the hereditary 

 adaptation of organisms to higher 

 temperature, 313 



— . A device for regulating the 

 temperature of incubators either 

 above or below room tempera- 

 ture, 309 



— . The effect of the concentration 

 of enzyme on the rate of digestion 

 of proteins by pepsin, 471 



— . The influence of hydrogen ion 

 concentration on the inactivation 

 of pepsin solutions, 465 



— . The influence of the substrate 

 concentration on the rate of hy- 

 drolysis of proteins by pepsin, 



595 



O 



Osterhout, W. J. V. Comparative 

 studies on respiration. VII. Res- 

 piration and antagonism. Intro- 

 ductory note, 1 



Parmenter, Charles L. The chro- 

 mosomes of parthenogenetic frogs, 



205 



R 



Raber, Oran L. The antagonistic 

 action of anions, 541 



— . A quantitative study of the 

 effect of anions on the permea- 

 bility of plant cells, 535 



Redfield, Alfred C, and Bright, 

 Elizabeth M. The relative phys- 

 iological effects of i3-rays of dif- 

 ferent velocities, 31 



— and — . The relative physio- 

 logical effects of /3- and 7-ray& 

 upon the egg of Nereis, 25 



Reed, H. S. The nature of the 

 growth rate, 545 



Schmitz, Henry. Enzyme action 

 in Echinodontium tinctorium 

 Ellis and Everhart, 613 



Swingle, W. W. Iodine and the 

 thyroid. IV. Quantitative ex- 

 periments on iodine feeding and 

 metamorphosis, 161 



U 



Uhlenhuth, Eduard. Regeneration 

 and neoteny, 325 



Zeleny, Charles. A change in the 

 bar gene of Drosophila involving: 

 further decrease in facet num- 

 ber and increase in dominancej, 



6g 



