VELOCITY OF REACTION. HOMOGENEOUS SYSTEMS 71 



do not vary from it more than may be attributed to the ex- 

 perimental errors. 



In quite the same manner experiments were done at 



different temperatures, and the observed values of K =- 



compared with the values calculated from the formula above 

 (ji 10,750). The results are tabulated below : 



INFLUENCE OF TEMPERATURE ON THE DIGESTION OF THYMOLGELATIN 



Segelcke and Storch * had already stated that a solution 

 of rennet coagulates milk in times which are inversely 

 proportional to the concentration of the solution. Soxhlet 

 confirmed these results by more accurate measurements. 

 On the basis of the proportionality of the digestion and the 

 coagulating power of peptic solutions of different prepara- 

 tion Pawlow concluded that rennet is probably identical 

 with pepsin. Hammarsten objected to Pawlow's opinion, 

 because the pepsin was said to follow the rule of Schiitz, 

 which was not the case with the rennet, according to 

 Soxhlet's experiments. This contradiction is evidently 

 not proved and Saw] alow therefore infers that all experi- 

 ments are in favour of Pawlow's opinion. Recent investi- 

 gations of Bang, Hemmeter, and Schmidt-Nielsen (cf. 

 Chapter IX) seem to indicate that pepsin in acid solution 



1 Segelcke and Storch : Ugeskrift for Landmaend (1870). 



