108 INJURY, RECOVERY, AND DEATH 



ments which were averaged to obtain the result the nearer 

 it approached to the calculated curve. 



Let UK now consider the behavior of tissues transferred 

 from a solution of 0.278 M CaClj (which has the conduc- 

 tivity of sea water) to sea water. In such a solution the 

 resistance rises and then falls. If tissue is allowed to 

 remain in the solution for a short time and is then replaced 

 in sea water the resistance falls rapidly, as shown in Fig. 

 42. This fall of resistance may be regarded as analogous 

 to the rise of resistance which occurs in the experiments 

 with NaCl and the term recovery may be used in both 

 cases. It is evident from the figure that as the exposure 

 to the solution of CaClj lengthens the level which is 

 reached as the result of recovery gets lower. This is pre- 

 cisely what happens in the experiments with NaCl. It 

 would therefore appear as though the same mechanism of 

 recovery were involved. If this is so the same method of 

 calculation should enable us to predict recovery in both 

 cases. This is found to be true. Using the same formulas 

 which have already been employed in the experiments 

 with NaCl we are able to predict the course of the curves 

 obtained in experiments with CaClz. This is rather strik- 

 ing in view of the fact that the two sets of curves differ 

 so fundamentally in appearance. 



In calculating the curves for CaCla the constants given 

 in Table V (page 98) are employed. The results are 

 shown as unbroken lines in Fig 42 (the dotted lines show 

 the experimental results). It is evident that the agree- 

 ment is very satisfactory. 



Some assistance in picturing the reactions which occur 

 during exposure is afforded by Fig. 43, which shows the 

 curve of + 10 in NaCl (unbroken line) and in CaCL 

 (dotted line). These curves are plotted from the calcu- 



