BACTERIOLYSINS AND HMMOLYSINS 83 



the ciliated epithelium and the red cells of the ox 

 possess common receptors. Analogous to this is 

 the action of the immune body resulting from the 

 injection of spermatozoa, as was pointed out by 

 Metchnikoff and Moxter. 



We see, then, that the specific action of immune 

 bodies is not so limited as to apply only to the cells 

 used in the immunizing process, but extends to 

 other cells which have receptors in common with 

 these. 1 



Coming now to the question as to what part of 

 the cell it is which excites the production of the 

 haemolytic immune body, we find this, according to 

 v. Dungern, to be the stroma of the red cells. If 

 this be so, it must be the stroma which combines 

 with the immune body. Nolf, however, claims 

 that the cell contents are factors in the production 

 of the immune body. So far as concerns the site 

 in the organism where the substances used in immu- 

 nizing find their receptors, this is not known for 

 the hsemolytic immune body. 



For the bactericidal immune bodies of cholera, 

 and typhoid the researches of Pfeiffer, Marx, and 

 others show that the chief site of production is in 



1 The same holds good for the agglutinins and the pre- 

 cipitins still to be studied. In these the action extends also 

 to closely related cells and bacteria, or in the case of the precipi- 

 tins to closely related albumins, as these possess a number of 

 receptors which are common to them and to the cells or sub- 

 stances used for immunizing. 



