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% 

 CaCl2 than in any other mixture and that they decrease 

 as the per cent. o,f CaClj decreases to 2.44%. Thus in 

 the case of Kj^ the value in 62.0% CaClj is 0.009, in 2.44% 

 CaCla 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 NaiXCa. These values 

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

 Kj^ is directly proportional to the increase in the amount 

 of Na4XCa. Hence we assume that Na4XCa acts as a 

 negative catalyzer or inhibitor of the reaction M — ^-B. 

 An inspection of Table X shows that the value of Ka 

 fluctuates with that of Km, except that as CaClg 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 CaClj in the mixture, the greater the 

 maximum attained. Since this maximum increases as the 

 value of Ka -i- Km increases, it is evident that the value 

 of Ka -i- Km must rise as the per cent, of CaCla becomes 

 greater. The value of Ka-t- Kum. the solution containing 

 1.41% of CaClg is 0.03333 while in the solution containing 

 62.0% CaCla 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 CaCla in the sur- 

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

 indicates that CaClg catalyzes^^ the reaction A — >- M; for 

 if this were not the case the value of Ka and JfjifWould rise 



"In the absence of Na,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. 



