VELOCITY OF REACTION. HOMOGENEOUS SYSTEMS 89 



DESTRUCTION OF RENNET IN PRESENCE OF SODIUM HYDRATE AT 46 C. 



The calculated values are deduced from the formula: 

 fi* -?o* =0,044 ('i-'o). 



Madsen has also investigated the destruction of trypsin 

 by means of alkalies and found similar regularities as for 

 the destruction of pepsin. 



Regarding the spontaneous attenuation of pepsin, Mad- 

 sen and Walbum found that the reaction is monomolecular, 

 which is shown in the following table. The increase of 

 this reaction with temperature gives /*= 75,600, that is, | of 

 the value for rennet (2 per cent solution). As the prepa- 

 rations are not identical and even used in different concen- 

 trations, this difference does not afford any data bearing on 

 the possible identity of rennet and pepsin. The strength of 

 the pepsin was determined by means of its digesting 

 influence on thymolgelatin. 



WEAKENING OF PEPSIN (5% SOL.) 

 AT 66.8 



WEAKENING OF PEPSIN AT DIFFERENT 

 TEMPERATURES 



0.0305. 



= 75,600. 



