88 



LECTURES ON IMMUNITY 



The reaction is monomolecular. The influence of tem- 

 perature is characterised by a rather high value of /*. 

 A second series gave /* = 91,000, so that in the mean 

 /A = 90,000. This attenuation is much more marked in 

 weaker than in stronger concentrations, as is indicated by 

 the following figures, valid for the temperature 46.i5C.: 



Dried powder of rennet is very resisting to the influence 

 of temperature ; ^=0.0414 at I58C. The reaction was 

 monomolecular. 



The destruction of the rennet is to a high degree accel- 

 erated by the presence of an alkali. To 200 c.c. of a 10 

 per cent rennet solution Madsen added from 0.5 c.c. to 3 c.c. 

 of i n. NaOH. He found that the velocity of destruction 

 proceeds more slowly than that of a monomolecular re- 

 action. This circumstance is probably due to a retarding 

 influence of the reaction-products. This influence may in 

 the following example, in which 3 c.c. of i n. NaOH 

 acted upon 200 c.c. of a solution of rennet at 46 C, be 

 put proportional to the third root of the quantity of ren- 

 net. ^ Ob8 indicates the quantity of rennet which is neces- 

 sary to cause coagulation in ten minutes. q^ Cf is the 

 corresponding calculated quantity. 



