THEORIES OF IMMUNITY. 



and carries the :<r specific " property that is not 

 possessed by the alexine at all. 



Bordet continued his most important studies 

 (Ann. de l'Inst. Past., 1898, T. XII., p. 688; 1899, 

 T. XIII., p. 273) by attempting to determine the 

 fate of the red blood corpuscles in the animal 

 body as the result of hemolysis. He established 

 the exceedingly narrow line between the devel- 

 opment of the bacteriolytic and the hemolytic 

 properties of the serum of animals, prepared by 

 repeated injections of bacteria and of blood, and 

 his results were soon confirmed by Ehrlich and 

 Morgenroth (Bed. Klin. Woch., 1899, p. 6), who 

 added the important conception that the sensi- 

 tizing substance of Bordet (the intermediary 

 body of Ehrlich and Morgenroth) has the prop- 

 erty of fixing itself in the red corpuscles. The 

 work of these three observers during the last 

 few years has rendered it possible to get some 

 conception of the mechanism of the action of 

 the two substances on the bacteria and the cells 

 of the animal tissues, as will be more clearly 

 stated below. 



33 



