OSTERHOUT— DYNAMICAL THEORY OF ANTAGONISM. 543 



be their concentration at equilibrium (as well as during the progress 

 of the reaction). Putting /C = .000001 and Conc_y =.001 we get 



.000001 = 



ConCxa-,A'CaCl4 



(66.67)2(33)(.ooi)' 

 whence 



ConCNasXCaCU = -000 1 468. 



Calculating the amounts formed in other mixtures we get the values 

 given in Table I. 



.000138 



NA2XCACL4 



Decrease in Kg 



.000058 



NaCl 

 CaCl. 



Fig. 



4. Curve of the increase of a salt compound, NajXCaCU 



( ), and curve of the decrease of the velocity constant K2 ( ). 



The figures apply to the ordinates of the former curve. The figures for the 



ordinates of the latter curve ( ) are 21.59 times as great. The 



abscissae represent molecular proportions in the solution (not in the sur- 

 face). The figure shows that the salt compound inhibits the reaction M — > 5 

 (which has the velocity constant K2). 



It is evident from an inspection of the last column of Table I. 

 that the decrease in K^ is directly proportional to the amount of 



