SUBJECTS 



697 



Histogenesis : 



Dynamics of (Carey) 357 



Hydrogen : 



Ions, reversal of sign of charge 

 of membranes by (Loeb) 



577 

 Hydrogen ion : 



Concentration, effect (North- 

 rop) ^ 113 

 — , — on respiration of Peni- 

 cillium chrysogenum (Gus- 

 tafson) 617 

 — , influence on inactivation of 

 pepsin solutions (North- 

 rop) 465 

 Hydrolysis : 



Rate, of proteins by pepsin, 

 influence of substrate con- 

 centration (Northrop) 



595 



Inactivation : 



Influence of hydrogen ion con- 

 centration on, of pepsin so- 

 lutions (Northrop) 



465 

 Licrease : 



Dominance, change in bar gene 

 of Drosophila involving (Ze- 

 leny) 69 



Incubator: 



Temperature of, device for 

 regulating, above room tem- 

 perature (Northrop) 



309 

 , — for regulating, be- 

 low room temperature 

 (Northrop) 309 

 Intensity: 



(Hecht) 337 



Iodine : 



(Swingle) 161 



Feeding, quantitative experi- 

 ments (Swingle) 



161 



Ion: 



Cause of influence of, on rate 



of diffusion of water through 



collodion membranes (Loeb) 



387, 563 



Hydrogen, reversal of sign of 

 charge of membranes bv 

 (Loeb) 577 



Ionic : 



Efliciency (Loeb) 673 



Radius (Loeb) 673 



Isoelectric point : 



Proteins in certain vegetable 

 juices, isoelectric points of 

 (CoHN, Gross, and John- 

 son) 145 



J 



Juice : 



Potato, saccharogenic actions 

 of (McGuiRE and Falk) 



215 



Vegetable, isoelectric points of 

 proteins in (Cohn, Gross, 

 and Johnson) 145 



K 



Kinetics : 



Action of catalase extract from 

 marine algae (Hampton and 

 Baas-Becking) 635 



Labyrinth : 



(Maxwell) 123, 349 



Dynamic functions of, mechan- 

 ism (Maxwell) 349 

 Light: 



Action in reduction of Cypri- 

 dina oxyluciferin (Harvey) 



207 

 Lucif erin : 



Cypridina, carbon dioxide pro- 

 duction during luminescence 

 of (Harvey) 133 



— , heat production during 

 luminescence of (Harvey) 



137 



