THE PITCHER LIQUOR OF NEPENTHES. 



115 



possible action of any thermostable catalyst present in the pitcher 

 liquor, and also for any action of the reagents on each other. 



The following reactions for the detection of a protease were 

 used : 



1. The formol-titration of Sorensen. 



2. The digestion of : 



(a) Carmine fibrin. 



(b) Edestan. 



(c) Protean of castor bean globulin. 



(d) Ricin (Jacoby). 



3. The cleavage of glycyltryptophane. 



Formol-titration. 



Composite samples of liquor, obtained from several pitchers, 

 were used, a different sample for each experiment. The indicator 

 was phenolphthalein. 



TABLE I. 



FoRMOL-TlTRATION AFTER DIGESTION. 



* According to Gotschlich (Kolle 

 pathogenen Mikroorganismen, 2 Auflage, 

 a mixture of different albumoses. 



und Wassermann, Handbuch der 

 1912, I., 102), Nahrstoff Heyden is 



