614 THEORY OF INJURY AND RECOVERY. IH 



2. At the start of the first recovery^ S is rapidly converted into A 

 but is partially restored during the subsequent stay in sea water and 

 at the beginning of the second exposure equals 2.7 (O -^90) in which 

 has the value given above (77.10). 



3. During exposure to NaCl the value of R diminishes from Rq 

 to Ri according to the formula 



^,.K,-'^'^^'== 1041.77 e- (»«'«'« (6) 



in which Ro = the value of R before the first exposure (1041.77) 

 and Te equals the total exposure to NaCl (20.8 + 21.2 = 42). 



It is evident that unless R is restored during the period in sea water 

 the speed of recovery wiU fall off somewhat with each successive 

 exposure. 



4. The value of M is the observed resistance (at the end of the 

 second exposure) less 10 or 64.18 — 10 = 54.18. 



5. The value of A is obtained by multiplying by 30 the resistance 

 observed at equiHbrium (less 10). This is based upon the following 

 considerations : 



Just before the beginning of the second exposure A and M are 

 assumed to be in equiHbrium in sea water, in which case as much of 

 A must decompose in any minute as of M (otherwise M would not 

 remain constant). But the amount of A which decomposes in 1 

 minute is AK^^ and of M is MK^', and since K^ is 30 times as great 

 as K^ it follows that A = SOM. At the beginning of the second 

 exposure M = 87.10 - 10 = 77.10 and ^ = (77.10)30 = 2313. 



In order to ascertain how the resistance would change during 

 the second exposure if it conformed to the standard curve employed 

 in a previous paper^ we may employ the formula 



Resistance = 2313 



/ Ka \f -KaTe -KmTe\,^^. -KmTe,.^ ,-. 



in which Ka = 0.018, K^f = 0.540 and T^ = time the tissue has 

 remained in the solution of NaCl. Comparing the values thus 

 obtained with the observed resistance after an exposure of 20 minutes 



^ If the value of were 90, 5 would be completely restored to its original value 

 of 2.7 but since has fallen to 77.10 it can only restore 5 to 2.7 (77.10 -i- 90). 



