INJURY AND RECOVERY 



93 



first lot rose to 78.2% (Pig. 38, upper dotted line), 

 but the resistance of the second fell (much more rapidly 

 than if it had not been removed to sea water) and eventu- 



140% 



Sea water 



40 



2,000 



3,000 mm. 



FIG. 38. Curves showing net electrical resistance of Laminaria aoardhii in a solution con- 

 taining 97.56 mols of NaCl to 2.44 mols of CaCh (Curve C) and in a solution containing 85 

 mols of NaCl to 15 mols of CaCh (Curve A). The dotted lines show recovery in sea water. 

 Curves B and D show the levels to which the resistance rises when the tissue recovers in eea 

 water after exposure to these mixtures; their abscissae denote the times of exposure. Curve 

 B pertains to the first mixture (belonging with Curve C), while Curve D pertains to the 



second mixture (belonging with Curve .A). 



ally became practically stationary at 38.1% (Fig. 38, 

 lower dotted line). 



If we plot the curve of permanent injury (i. e. level 

 to which the resistance rises after replacing the tissue 

 in sea water) after various periods of exposure to the 

 first mixture, we get Curve B (and for the second mix- 

 ture, Curve D). 



