INJURY AND RECOVERY 



109 



lated values; the observed values are shown as points; 

 it will be observed that they lie fairly close to the 

 calculated curve. The figure also shows the calculated 

 values of $; in this case no observed values are given 

 because such values cannot be very precisely determined. 

 This is owing to the fact that the value of S affects only 



1007,- 



X XX 





X. in Ca C1 2 



\S in Ca C1 2 



in Na Cl 



S in Na Cl 



200 400 GOOmin. 



Fia. 43. Curves showing the values of O + 10 in NaCl (upper unbroken line) and in CaC 

 (upper dotted line); also the values of S in NaCl (lower unbroken line) and in CaCh (lower 

 dotted line). The ordinates give the values of O; these must be multiplied by 6.75 to obtain 

 the values of S. The observed points represent the average of eight or more experiments; 

 probable error of the mean less than 10% of th* mean. 



the speed of recovery (not the final level attained) and as 

 the speed is variable the only satisfactory procedure is to 

 assume such values of K _ and K _ as cause the closest 



K o 



approximation to the observed speed of recovery. When 

 these values have been found the value of 8 can readily 

 be calculated. The results of these calculations are plot- 

 ted in Fig. 43. 



In this figure the ordinates give the values of + 10 : 

 these must be multiplied by 6.75 to obtain the values of 8. 

 In all curves the value of 8 at the start is 2.7 (the value of 



