452 



COLLECTED STUDIES IN IMMUNITY 



addition of lecithin and of blood solution. These characteristics are 

 as follows: 



1. The hsemolytic activity at 0. 



2. The comparatively rapid course of haemolysis. 



3. The marked inhibitory action of cholesterin. (See Table X.) 



TABLE IX. 



5 cc. haemoglobin X 5 cc 0.0125% lecithin solution. 



TABLE X. 



t=complete solvent dose. 



It will be remembered that in these three points guinea-pig serum 

 exhibited exactly the opposite behavior, a fact which led us to ascribe 

 its activating power to true complements, 



We have therefore come to the conclusion that solution by means 

 of blood solutions is only a property of the lecithin contained in 

 the blood-cell stroma, and is not due to true complements. We 

 know that according to Ehrlich's 1 conception the stroma ta of the 

 red blood-cells are to be looked upon as living protoplasm. In this 



1 Ehrlich, Zur Physiologic und Pathologic der Blutscheiben, Charite An- 

 nalen, Vol. X, 1885. 



