424 



THEORY OF INJURY .\XD RECO\'ERY. II 



The relation between AV and Kq is taken as constant in the pro- 

 portion of 100 to 99. 



It is e\'ident that when the constants have been empirically deter- 

 mined for two mixtures the constants for any other mixture can be 

 calculated at once, since all of them depend in a definite manner on 

 NaiXCa (K^ and Kj^ also depend on the percent of CaCl2). The 

 agreement between the constants thus obtained by calculation and 

 those foimd by trial is fairly close, as is evident from Figs. 2 and 3.^ 



It has been shown in a pre\ious paper that the height to which 

 the recovery curv^e rises depends on the value of 0: the value of 



100. NaCl + Q CaCl2 



4000 .^MNUTES 



Fig. 4. Cur\-e5 showing the value of — 10 in 0.52 m XaCl, in 0.278 ii CaC]2, 

 and in mixtures of these (the figures attached to the curves show the molecular 

 per cent of CaCl2 in the solution). The ordinates give the relative values of 

 -f 10, the value in sea water being arbitrarily taken as 100 per cent. These 

 values are obtained by exposing tissue to toxic solutions and then finding the level 

 to which the resistance rises or falls after the tissue is replaced in sea water: they 

 are therefore a measure of permanent injur\'. The abscissae give the length of 

 exposure to the toxic solution. The curves show the calculated values (using 

 the velocit}' constants given in Table 11). The points show the observed values; 

 each represents the average of sLx or more experiments. Probable error of the 

 mean less than 10 per cent of the mean. 



* The constants obtained by calculation would fall exactly on the graphs in 

 these figures while those fovmd by trial are indicated by the points given. 



