54 



LECTURES ON IMMUNITY 



(a x) + nx dt (ax)+nx' 



which, integrated, gives the formula of Bodenstein ; 



In this case we find a sufficient agreement with the experi- 

 mental results, if we suppose n ^, as Henri has shown. 

 For invertase acting on saccharose n 0.5, and for emulsin 

 acting on salicin n 2. Of course the introduction of a 

 new constant n is favourable to the agreement between the 

 calculation and the observation. Still Henri finds that the 

 agreement for the maltose is not very satisfying (K^ varies 

 between 0.028 and 0.046). - 



Henri therefore proposes to introduce still a new em- 

 pirical constant in the equation for K^. But it is to be 

 feared that the calculation will not repay the work laid 

 out upon it as long as the experiments are so contradic- 

 tory as now. For instance, I have calculated some obser- 

 vations of Mr. Terroine cited by Henri (I.e. p. 6) according 

 to his formula and found K very nearly constant = 564- io~ 5 , 

 as will be seen from the following figures for a 2 per cent 

 solution of maltose: 



