X CONTENTS 



CHAPTER VI 



PAGE 

 THE ACTION OF NEUTRAL SALTS ON THE PHYSICAL PROPERTIES OF 



PROTEINS 88 



1. The Difference in the Effect of Acids, Alkalies, and Salts on 



Proteins 88 



2. Ion Series and the Action of Salts on Proteins 99 



CHAPTER VII 



THE INADEQUACY OF THE PRESENT THEORIES OF COLLOIDAL BEHA- 

 VIOR 112 



PART II 



Theory of Colloidal Behavior Based on Donnan's Theory of Membrane 



Equilibria 



CHAPTER VIII 



MEMBRANE POTENTIALS 120 



The Influence of the Hydrogen Ion Concentration of Gelatin 



Solutions on the P.D 126 



The Explanation of the P.D. Curve 127 



The Valency Effect 132 



Hydrogen Ion and Chlorine Ion Potentials 135 



The P.D. of Na Gelatinate 137 



The Influence of Neutral Salts on the P.D. of Gelatin Chloride 



Solutions 139 



The Influence of the Sign of Charge 144 



The Influence of the Concentration of Protein on the P.D ... 145 



The P.D. of Solutions of Crystalline Egg Albumin 145 



CHAPTER IX 



THE ORIGIN OF THE ELECTRICAL CHARGES OF MICELLES, AND OF 



LIVING CELLS AND TISSUES 150 



1. Stability of Suspensions, Electrical Charge of Micellae, and 



Donnan Equilibrium 150 



2. The Electrical Charge of Suspended Particles of Powdered 



Gelatin 152 



3. The Influence of pH on the Charge of Suspended Particles of 



Powdered Gelatin 155 



4. The Influence of Acid and Alkali on the Sign of Charge of 



Micellae 155 



5. The Influence of Salts on the Charge of Suspended Particles of 



Gelatin . 157 



6. The Origin of the Electrical Charges of Living Cells and Tis- 



sues. . 166 



