PROPERTIES OF ANTISENSITIZERS. 311 



general way against any and all sensitizers, normal or specific, present 

 in the alien serum. The production of this antagonistic substance 

 is not in any way dependent on the identity or even on a close 

 relation in composition between the cells of the animal body and 

 the substances injected. There is no reason, in other words, to 

 assume the existence of common receptors. 



