110 INJURY, RECOVERY, AND DEATH 



S in sea water^" ) ; tMs appears on the ordinate in the 

 figure as 2.7 -=- 6.75 = 0.4. The curves rise to a maximum 

 and then fall to zero. The curves for + 10 start at 100 

 and fall to 10 (since the base line is taken as 10, just as in 

 the curve of M) . 



It is found that the rate of recQvery is approximately 

 the same in all cases ; this applies to the experiments with 

 CaClj as well as with those in NaCl. In general it may be 

 said that it usually requires about 60 minutes for the 

 curve to complete nine-tenths of the total rise or fall which 

 occurs in recovery. 



If the theory here developed is sound it should also 

 enable us to predict the behavior of tissue transferred 

 from one toxic solution to another. In order to put this 

 to a test a variety of experiments was made in which the 

 tissue was exposed to several solutions in succession. 



I. Alternate Exposure to NaCl and Sea Water. 



The procedure may be illustrated by a typical experi- 

 ment, the results of which are shown in Fig. 44. 



The tissue was exposed for 20.8 minutes^^ to 0.52 M 

 NaCl, during which time the resistance fell from 100 to 

 74.03%. After 20.8 minutes in the solution of NaCl 

 the value of T^ (in formulas (2), (3) and (5)) is 20.8 

 and the following results are obtained : A = 1856.80, 8 = 

 484.06, M = 64.03, = 88.41. When the tissue has been 



™ The normal value of S in sea water is taken as 2.7 wHch is exceed- 

 ingly small as compared with the amount of 0. The amount of 8 which is 

 produced from in each unit of time is relatively large, but 8 is so rapidly 

 transferred into A that its amount in sea water never becomes greater 

 than 2.7. 



'"This is corrected from 20 minutes (as previously explained) in order 

 to make it conform to the standard curve. 



