154 INJURY, RECOVERY, AND DEATH 







which the recovery curve rises depends on the value of 

 : the value of -f 10 is shown for all the solutions 17 in 

 Fig. 66, which shows the agreement between observation 

 and calculation in respect to the final level reached by 

 the recovery curve, but not in respect to speed of recovery, 

 which depends more on the value of S than on that of 0. 

 The rate of recovery seems to be about the same in the 

 mixtures as in the pure salts. In general it is found that 



O 



2000 



4000 MINUTES 



Fio. 66. Curves showing the value of O + 10 in 0.52 M NaCl, in 0.278 M CaCh, and in 

 mixtures of these (the figures attached to the curves show the molecular per cent, of CaCh in 

 the solution). The ordinates give the relative values of O +|10, the value in sea water being 

 arbitrarily taken as 100%. 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 injury. The abscissae give 

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

 the velocity constants given in Table X). The points show the observed values; each repre- 

 sents the average of six or more experiments. Probable error of the mean less than 10% of 



the mean. 



the rise or fall is nine-tenths completed in about an hour. 



Fig. 67 shows the calculated values of $; observed 



values are not given because they cannot be very pre- 



"The values of O + 10 for solutions containing 2.44 and 15.0% 

 CaClj differ slightly from those given earlier for the reason that the 

 curves here presented include a larger series of experiments. 10 is added 

 to the value of because the base line is taken as 10, just as in the 

 case of M. 



