VELOCITY OF REACTION. HETEROGENEOUS SYSTEMS 123 



servation was confirmed by Stade, 1 as may be seen from 

 the above figures (temp. 40). 



If the digestion proceeds further than 25 per cent the 

 rule of Schiitz is no longer applicable. We then may use 

 the general formula (p. 64) as is seen by the next figures 

 valid for digestion by gastric juice during 16 hours at 

 40 C. (.AT/* =27): 



Stade has further done a series of measurements of the 

 progress of saponification of an emulsion of the fat from the 

 yolk of egg by neutralised gastric juice. These measure- 

 ments follow nearly the same formula as those of Sjoqvist, 

 as may be seen from the calculated values. 

 PROGRESS OF SAPONIFICATION OF YOLK OF EGG BY MEANS OF GASTRIC JUICE 



1 Stade : Hofmtistcrs Beitr'dge, 3. 291 (1902). The dates with an asterisk 

 are the means of two measurements. 



