PART THREE 



THE ANALOGIES IN THE COLLOID-CHEMISTRY OF' 

 SOAPS, PROTEIN DERIVATIVES AND TISSUES 



THE CHEMICAL AND COLLOID-CHEMICAL BEHAVIOR OF 

 FATTY ACIDS AND THEIR DERIVATIVES AND THE 

 ANALOGOUS BEHAVIOR OF "NEUTRAL" PROTEINS 

 AND THEIR DERIVATIVES 



1. Introduction 



THE experiments on the colloid-chemistry of the various pure 

 soaps detailed in the preceding pages were undertaken originally 

 in order to obtain a clearer conception of the nature of water 

 absorption by proteins when various alkalies, acids or salts, alone 

 or in combination, are added to them; this conception being 

 wanted, in its turn, in order to understand the laws of water 

 absorption as observed in living matter. It will be the purpose 

 of the next paragraphs to show that the laws emphasized as govern- 

 ing the " solution " and " hydration " of soaps are identical with 

 those which govern the " solution " and " hi/th-<ition " of varitmx 

 protein derivatives and that these, in turn, arc tin- <uuilogs of the laws 

 which govern the absorption of water by cells, tissues and the whole 

 living organism under physiological and pathological circumstances. 



2. The Chemical Behavior of the Fatty Acids and the Analogous 

 Behavior of the Amino- Acids (Neutral Proteins) 



I' is well to rmpliasi/r. first, sonic ;.l>vi>us chemical analogies 

 existent between the fatty acids and the materials which may be 

 derived from thorn (the soaps) and the so-called "neutral" 



m 



