INJURY AND RECOVERY 111 



replaced in sea water and left for 10.4 minutes 32 the value 

 of T R (in formulas (6) and (7) ) is 10.4 and the value of L 

 is found to be 1.33. 



lOOQ 



5o- 



o 



x Na Cl 

 o Sea Water 



o 



-T , 



4OO MINUTES 80O 



FIG. 44. Curves showing the net electrical resistance of Laminaria agardhii in NaCl 0.52 M 

 and in sea water. Unbroken line, calculated values; broken line, observed values. Average 

 I of ten or more experiments; probable error of the mean less than 10% of the mean. 



Substituting these values in formula (1) we find that 

 when the tissue has been replaced in sea water the resis- 

 tance at the end of 10.4 minutes is 83.49. Proceeding in 

 this manner we calculate the resistance at various 

 intervals after replacement in sea water and obtain the 

 first (calculated) recovery curve shown in Fig. 44. It is 

 evident that it is in fairly good agreement with the 

 observed values. 



After 200 minutes in sea water (during which the 

 resistance rose to 87.10% and remained practically 

 constant) the tissue was replaced in the solution of NaCl. 

 In the course of 21.2 minutes 33 the resistance fell from 



32 This is corrected from 10 minutes (as previously explained). 

 33 The actual time was 20 minutes: the manner in which the corrected 

 figure is obtained is explained in a subsequent paragraph. 



