524 



E. N. PAVLOVSKY AND E. J. 7ARIN 



activity of tho samo ferment, on the contrary, sharply increased 

 with the (kiration of infusion of the extract. Thus, already 

 after one day, the active power of catalase increases nearly 

 four times, and on the third day nearly six times ; only 

 beginning from the seventh day the activity began to decrease 



sharply. 



Curve 1. 



'i.1 2 3 



JOdays. 



Curve representing the variation of the activity of catalase, according 

 to the length of uifusion of the intestine and in connexion with the method 

 of preparation of the extract (series of ex])eriments nos. 17, 20, 21. See 

 Table III). 



Such a difference in the activity of catalase in the two 

 parallel experiments described is due, in our opinion, to the 

 mode of preparation of the extracts. \Anien the stomach is 

 finely minced and rubbed, and the cells of its tissues destroyed, 

 a maximum quantity of catalase is freed which gradually 

 becomes inactivated while the extract stands. In extracts 

 from intact pieces of the stomach in which but a small number 



