150 INJURY, RECOVERY, AND DEATH 



shown in Column 6 of the table). Conversely we find 

 (Table X) that the velocity constants are higher in 62.0% 

 CaCl 2 than in any other mixture and that they decrease 

 as the per cent, of CaCl 2 decreases to 2.44%. Thus in 

 the case of K M the value in 62.0% CaCL is 0.009, in 2.44% 

 CaCl 2 it is less by 0.00354, while in 15.0% it is less by 

 0.0017, and in 35.0% by 0.00041 ; if we multiply these num- 

 bers by the constant factor 0.251 they agree very closely 

 with the figures for the increase in Na 4 XCa. These values 

 are plotted in Fig. 64, which shows that the decrease in 

 K M is directly proportional to the increase in the amount 

 of Na 4 XCa. Hence we assume that Na 4 XCa acts as a 

 negative catalyzer or inhibitor of the reaction M >B. 

 An inspection of Table X shows that the value of K A 

 fluctuates with that of KM, except that as CaCl 2 increases 

 the value of KA rises more rapidly than that of KM. This 

 is also obvious from Fig. 59, which shows that the greater 

 the per cent, of CaCl 2 in the mixture, the greater the 

 maximum attained. Since this maximum increases as the 

 value of KA -r- KM increases, it is evident that the value 

 of KA -T- KM must rise as the per cent, of CaCl 2 becomes 

 greater. The value of KA-^ Kuin the solution containing 

 1.41% of CaCl 2 is 0.03333 while in the solution containing 

 62.0% CaCl 2 it is 0.05889, an increase of 0.02556. If we 

 calculate this increase for the other mixtures and plot the 

 values so obtained against the per cent, of CaCL in the sur- 

 face, we obtain a straight line as shown in Fig. 65. This 

 indicates that CaCl 2 catalyzes 13 the reaction A > M for 

 if this were not the case the value of KA and J^^-would rise 



13 



In the absence of Na 4 XCa it would appear that NaCl catalyzes the 

 death process, since death is more rapid in NaCl 0.52 M than in 0.26 M. 



