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THEORY OF INJURY AND RECOVERY. II 



tures, depends largely on a compound Na4XCa formed by the combi- 

 nation of Na and Ca with a constituent X of the protoplasm. It is 

 not necessary to discuss these asumptions more fully at present. But 

 it may be pointed out that two things seem to be fairly well estab- 

 lished; (1) a consistent mechanism underlies the entire behavior of the 



Fig. 8. Curves showing the electrical resistance (curve which ascends and 

 descends) of Laminaria agardhii in a mixture containing 38 mols of NaCl to 62 

 mols of CaCl2, and recovery in sea water (descending curves). The figure 

 attached to each recovery curve denotes the time of exposure (in minutes) to 

 the toxic solution. In the recovery curves, the experimental results are shown 

 by the broken lines, the calculated results by the unbroken lines. The observed 

 points represent the average of six or more experiments. Probable error of the 

 mean less than 10 per cent of the mean. 



tissue, and (2) its operation can be predicted with a fair degree of 

 accuracy by means of the equations which have been developed. 

 The predictive value of these equations may be regarded as perma- 

 nently established, since it does not depend on our views regarding the 

 underlying assumptions. 



