102 INJUEY, RECOVERY, AND DEATH 



solution of NaCl the reactions which occur are: (1) 

 A—^M-^^B; (2) R-^S-^T; and (3) N-^O-^P. 

 Let us first consider the reactions A — >M — > B. The 

 value of A in sea water is taken as 2,700 and that of M as 

 90. As previously explained the value of A will diminish 



50 100 150 min. 



Fig. 41. — Cutves showing the fall of net electrical resistance of Laminaria agardhii in 0.52 M 

 NaCl (descending curve) and recovery in sea water (ascending curves). The figure attached 

 to each recovery curve denotes the time of exposure (in minutes) to the solution of NaCl. 

 In the recovery curves the experimental results are shown by dotted lines, the calculated 

 results by the^unbrolcen lines (the curves are extended beyond the last observed point shown 

 because of later observations which cannot be shown in the figure). The observed points 

 represent the average of eight or more experiments; probable error of the mean less than 10% 



of the mean. 



during exposure to NaCl according to the formula 



A=■2^Q0e (2) 



in which T^is the time of exposure to the solution. 

 Since K^ = 0.018 (see Table V) the value of A after 15.9 

 minutes in NaCl 0.52 M is 



— (0.018) 15.9 

 2,700 c '^'=2,027.96 



The value of M at the end of 15.9 minutes is the observed 



resistance 80.69 less 10 (since the base line of the curve 



is not but 10). 



