146 INJURY, RECOVERY, AND DEATH 



the salt compound, if it takes place in the surface, will 

 not be affected by an increase in the concentration of the 

 salts in the solution. It will, however, be affected by 

 changes in the relative proportions of the salts. The 



150% 



100 



Fia. 63. Curve of net electrical resistance of Laminaria agardhii in 38 NaCl + 62 CaCl* 

 (unbroken line) and the trial curve (broken line) calculated from the velocity constants 

 KA = .000530 and KM = .0090. Each observed point represents the average of six or more 

 experiments: probable error of the mean less than 10% of the mean. All readings were 



made at 15 C. or corrected to this temperature. 



number of molecules of salt in a unit of surface will 

 remain nearly constant, but if the proportion of NaCl in 

 the solution be increased some of the CaCL in the surface 

 will be displaced by NaCl. 



Below the saturation point the relative proportions 

 of the salts will be of less importance than their total 

 concentration: this is the case at low concentrations in 

 the region of the so-called "nutritive effects. " 



