CONTENTS Jx 



CoHN, Edwin Joseph. Studies in the physical chemistry of the 

 proteins. I. The solubility of certain proteins at their 

 isoelectric points ^q.^ 



Crozier, W. J. Cell penetration by acids. V. Note on the 



estimation of permeability changes 723 



Hitchcock, David I. The combination of gelatin with hydro^ 

 chloric acid ^ ^^ 



LOEB, Jacques. The mechanism by which trivalent and tetrava- 

 lent ions produce an electrical charge on isoelectric protein . . 741 



LoEB, Jacques. Ionizing influence of salts with trivalent and 

 tetravalent ions on crystalHne egg albumin at the isoelectric 

 point ^^^ 



LoEB,, Jacques. On the influence of aggregates on the membrane 

 potentials and the osmotic pressure of protein solutions 769 



