ANTAGONISM 151 



and fall in such a way that the value of Ka -4- Km would 

 remain constant. 



It is evident from Figs. 64 and 65 that the values of Ka 

 and Km are determined by the amount of Na4XCa and by 

 the per cent, of CaCla in the mixture, and that when 

 these values are experimentally determined for any two 



o ^ 



65,73 84.54 9'^22 '00 



Fig. 65. — Graph showing the increase of K^ -^iL^and the value of K^ -i-K^&B the molecular 

 per cent, of CaClz increases. The figure shows that CaCla acta as a catalyzer of the reaction 

 A — >■ JIf {which has the velocity constant K^) and also of the reaction R — >• S (which has the 

 velocity constant Kj^'. The figures on the ordinate at. the right show the values of 

 Kg -!- Ky, those on the ordinate at the left show the increase in the value of K^ -j- Kj^f 

 over the value found in the mixture containing 1.41% CaCh. The abscissae denote molecular 

 per cent, of CaCh in the surface (not in the solution). 



mixtures they can be calculated for any other mixture. 

 When this is done we can calculate the course of the death 

 curve in that mixture. 



Having thus accounted for the death curves, we may 

 turn our attention to the process of recovery. We find 

 that, when tissue is removed from a mixture of NaCl and 

 CaCla, and replaced in sea water, the resistance at once 

 rises or falls and after a time becomes stationary. This 

 rise or fall of resistance may be called recovery. 



In order to account for the facts we suppose that when 



