CONTENTS Vll 



LoEB Tacques. The physiological basis of morphological polar- 



'2 "2 *7 



ity in regeneration. I ^^ ' 



LoEB, Jacques. Amphoteric colloids. III. Chemical basis of 



the influence of acid upon the physical properties of gelatin. . 363 



No. 4, March 20, 1919. 



Henderson, L. J., FenN, W. O., and Cohn, Edwin J. In- 

 fluence of electrolytes upon the viscosity of dough 387 



Irwin, Marian. Comparative studies on respiration. VI. 

 Increased production of carbon dioxide accompanied by 

 decrease of acidity. . . ? ; • ^^^ 



Osterhout, W. J. V. Decrease of permeability and antagonis- 

 tic effects caused by bile salts 405 



Osterhout, W. J. V. A comparison of permeability in plant 

 and animal cells 



Harvey, E. Newton. The relation between the oxygen con- 

 centration and rate of reduction of methylene blue by 

 milk 415 



Itano, Arao, and Neill, James. Influence of temperature and 

 hydrogen ion concentration upon the spore cycle of Bacil- 

 lus subtilis 



Hackh Ingo W. D. Bioelements; the chemical elements of 



'. 4-79 



livmg matter ; • • ■ • 



Patten, Bradley M. Photoreactions of partially blinded 

 whip-tail scorpions 



Henderson, L. J., Cohn, Edwin J., Cathcart, P. H., Wach- 

 MAN T. D., and Fenn, W. O. A study of the action of 



4-^0 

 acid and alkali on gluten • • ^^^ 



Uhlenhuth, Eduard. Relation between thyroid gland, meta- 

 morphosis, and growth 



LoEB, Jacques. Amphoteric colloids. IV. The influence of the 



valency of cations upon the physical properties of gelatin. . . 483 



No. 5, May 20, 1919. 

 Moore, A. R. The selective action of nicotine on the central 



nervous system of the squid, Loligo pealii 505 



Swingle, W. W. On the experimental production of edema 



S09 

 by nephrectomy 



