COLLECTED STUDIES IN IMMUNITY. 



These substances show a certain analogy to the bactericidal 

 bodies obtained by Conradi l in the autolysis of organs, since the 

 latter are also coctostable and soluble in alcohol. In contrast to 

 the former, however, Conradi 's substances pass through porous filters. 



At present it is impossible to say whether these substances are 

 already preformed in the living cell or whether they originate only on 

 the disintegration of the living protoplasm either through destruction 

 of the cells or through the influence of the extracting agents. The 

 presence of amboceptors and complements in the living cell is in no 

 way prejudiced by this demonstration. In the future, however, the 

 sources of error pointed out by us must be taken into account in 

 drawing conclusions. 



One thing must be regarded as certain, that these experiments 

 disprove the identity of the haemolytic substances in question and 

 the "cytases" in the complements of serum. 



1 Conradi, Beitrage zur chetn. Physiol, in Pathol., Vol. 1, Nos. 5 and 6, 1901. 



