152 INJUEY, EECOVEEY, AND DEATH 



we replace the tissue in sea water the reactions — >■ 

 8 — ^A — >-M — >-J5 proceed at the rates which are nor- 

 mal for sea water. The manner in which the rate of 

 recovery is calculated has already been explained in 

 detail. It is assumed that during the exposure 

 to any of the mixtures the following reactions occur: (1) 

 N—^0—^P;{'^)R-^S^T;{^)A—^M^B. By 

 assuming values of the velocity constants of these' 

 reactions we can approximate the observed results. The 

 velocity constants thus fouad are given in Table X. An 

 inspection of the table shows that all these velocity 

 constants behave like Ka and Km in that as the per cent, 

 of CaClj in the mixture increases (beginning with 1.41% 

 CaCl^) the value of the velocity constant first falls and 

 then rises, and that this value in every case reaches its 

 minumum in the mixture containing 97.56 NaCl + 2.44 

 CaClo. It would therefore appear that the reactions 

 IV — *^ -^- P and E — > /S^ ^ T are inhibited by Na4XCa 

 in the same manner as the reactions A — >M — ^B. This 

 is borne out by an inspection of Fig. 64, in which the 

 decrease^'' of the velocity constants is plotted, together 

 with the increase of Na4XCa. 



" By the decrease in the velocity constant is meant the decrease which 

 we observe as we pass from the solution containing the highest per cent, 

 of calcium (38.0% NaCl + 62.0% CaClJ to mixtures containing smaller 

 per cents of calcium. Thus the decrease of ^j^= 0.009 — ^m^^^ decrease 

 of .£„= 0.00134 — Kjf-, the decrease of Kq= 0.0013266 — K^; and the 

 decrease of jK^ = 0.00319 — Kq . In the same manner we find that the 

 increase in the amount of NajXCa = amount of Na4XCa — 0.000047. 



The decrease of the amount of K, and X^ is not shown in the 

 figure because it depends not only on Na,XCa, but also on the per cent, 

 of CaCl:,. 



The fact that even in the presence of the maximum amount of Na^XCa 

 these velocity constants are greater than in sea water is of course to 

 be attributed to the other substances present in sea water. 



