LECTURES ON IMMUNITY 



Whereas K increases regularly with time in the propor- 

 tion I : 1.6, KI is nearly constant. The quantity trans- 

 formed in a certain time is proportional to the quantity of 

 diastase present, but no.t to the concentration of the 

 cane sugar in the solution. In a rather large interval 

 (o. 1 5-0.6 n.), the transformed quantity is independent of 

 the concentration of cane sugar, as Duclaux maintained, 

 but at low and high concentrations we get lower values 

 than at mean concentrations. At very low concentra- 

 tions the transformed quantity is proportional to the 

 concentration of cane sugar. 1 



In some other cases also the formula of Henri has been 

 verified. Still it seems probable that in dilute solutions of 

 sugar the reaction is of the pure monomolecular type. 

 Only at higher concentrations do deviations occur. Bar- 

 endrecht 2 has suggested a very singular theory, according 

 to which the deviations might be due to an absorption by 

 the molecules of the sugar of a kind of radiation emanat- 

 ing from the enzyme, which emanation is said to produce 



1 Adrian Brown : " Enzyme Action," Journ. Chem. Soc. 81. 387 (1902). 



2 Barendrecht : Zeitscr. /. ph. Ch. 49. 456 (1904). 



