4 8 



LECTURES ON IMMUNITY 



figures, is that of the decomposition of haemolysin into 

 immune-body and alexin, and the alexin is destroyed still 

 more rapidly. But the reverse may also be true. The 

 figures indicate that at 60 C. a heating for o.i minute will 

 practically decompose the haemolysin totally and give a 

 solution of immune-body free from alexin. 



The first reaction of enzymes namely, the influence 

 of emulsin on salicin, studied by Tammann according to 

 methods used in physical chemistry seems to be of a 

 complicated nature. The process seems to be monomolec- 

 ular at low temperatures, as is shown by the following 

 figures, indicating the strength (concentration) of a solu- 

 tion containing in the beginning 3.007 g. salicin and 0.08 g. 

 emulsin in 100 c.c. 



DESTRUCTION OF SALICIN BY EMULSIN AT 25 C. 



^=0.057. 



The last figures seem to indicate that the process is re- 

 tarded at its end. This is still more conspicuous at higher 

 temperatures. Therefore we should not overestimate the 

 accuracy of p calculated from Tammann's figures and 

 giving fi = 3330, 1 corresponding to an increase in the 

 proportion of only 1.2 : i in an interval of 10 C. 



1 Tammann, Zeitschr. f. ph.. Ch. 18. 436 (1895), gives /* = 2 ^ = 5870, 

 which is evidently due to some misprint or other error. 



