232 COLLECTED STUDIES IN IMMUNITY. 



of poly enzyme. Analogous views have been expressed by Nencki l 

 for the ferments of the digestive tract. Even though his conception, 

 that pepsin is a single ferment with different active groups (pepsin 

 group, rennin group, plastin-forming group), does not entirely apply, 

 we must say that his conception of such polyenz}^mes is fully justi- 

 fied. The properties of the amboceptor above demonstrated will, we 

 believe, speak in favor of the essential soundness of the view of this 

 eminent chemist. 



1 Nencki and Sieber, Zeitschr. f. physiol. Chem. 1901. 



