CONTENTS IX 



LoEB, Jacques. Donnan equilibrium and the physical proper- 

 ties of proteins. I. Membrane potentials 667 



LoEB, Jacques. Donnan equilibrium and the physical proper- 

 ties of proteins. II. Osrnotic pressure 691 



No. 6, July 20, 1921. 



Northrop, John H. The role of the activity coefficient of the 



hydrogen ion in the hydrolysis of gelatin 715 



DU NotJY, P. Lecomte. Energy and vision 743 



Brody, Samuel. The rate of growth of the domestic fowl 765 



Coulter, Calvin B. The thermolability of complement in 



relation to the hydrogen ion concentration 771 



LiLLiE, Ralph S. A simple case of salt antagonism in starfish 



eggs , 783 



ScHMiTZ, Henry. Studies in wood decay. II. Enzjmie action 



in Polyporus volvatus Peck and Fomes igniarius (L.) Gillet . . 795 



Palmer, Walter W., Atchley, Dana W., and Loeb, Robert F. 

 Studies in the regulation of osmotic pressure. I. The effect 

 of increasing concentrations of gelatin on the conductivity 

 of sodium chloride solution « 801 



Pond, Samuel Ernest. Correlation of the propagation-velocity 

 of the contraction-wave in muscle with the electrical con- 

 ductivity of the surrounding medium 807 



Loeb, Jacques. Donnan equihbrium and the physical proper- 

 ties of proteins. HI. Viscosity 827 



Index to Volume III 843 



