OSTERHOUT— DYNAMICAL THEORY OF ANTAGONISM. 545 



dependent on the per cent, of CaCU present in the surface. If this 

 assumption is correct the vahie of K-^-^K., will be proportional to 

 the per cent, of CaCL. This is actually the case, as is evident from 

 Table II. and Fig. 5. 



Fig. S. Curve of the increase of K^^K. with increase of CaCL (molec- 

 ular per cent, in the surface). The figure shows that CaCU acts as a 

 catalyzer of the reaction A —> M (which has the velocity constant ivj). 



We must therefore conclude that the reaction ^ -^ M is cata- 

 lyzed by CaClo, while the salt compound NaoXCaCl^ inhibits both 

 A^>M and M-^B. This assumption enables us to calculate the 

 resistance at any time in any mixture. The calculated results are 

 given in Table III. together with the observed values. The calcula- 

 tions are made on the assumption that the decrease of Ko is exactly 

 proportional to the increase of Na„XCaCl4, that is 



and 



decrease of Ki 

 increase of NaoXCaCL 



increase of {Ki -^ K2) 

 per cent. CaCl2 in surface 



= 23.29 



= .000271. 



