CONTENTS 



Northrop, John H. The stability of bacterial suspensions. I. A 



convenient cell for microscopic cataphoresis experiments 629 



Northrop, John H., and Cullen, Glenn E. An apparatus for 

 macroscopic cataphoresis experiments 635 



Northrop, John H., and DeKruif, Paul H. The stability of bac- 

 terial suspensions. II. The agglutination of the bacillus of 

 rabbit septicemia and of Bacillus typhosus by electrolytes 639 



Northrop, John H., and DeKruif, Paul H. The stability of 

 bacterial suspensions. III. Agglutination in the presence of 

 proteins, normal serum, and immune serum 655 



Eggerth, Arnold H., and Bellows, Margaret. The flocculation 



of bacteria by proteins 669 



Schmidt, Carl L. A., and Norman, G. F. Further studies on eosin 

 hemolysis 681 



Parker, G. H. The calibration of the Osterhout respiratory appa- 

 ratus for absolute quantities of carbon dioxide 689 



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

 proteins. I. The solubility of certain proteins at their isoelectric 

 points 697 



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

 tion of permeabiHty changes 723 



Hitchcock, David I. The combination of gelatin with hydrochloric 

 acid 733 



LoEB, Jacques. The mechanism by which trivalent and tetravalent 



ions produce an electrical charge on isoelectric protein 741 



LoEB, Jacques. Ionizing influence of salts with trivalent and tetra- 

 valent ions on crystalline egg albumin at the isoelectric point . . . 759 



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



potentials and the osmotic pressure of protein solutions 769 



Index to Volume IV 777 



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