JACQUES LOEB 



465 



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Concentration 



Fig. 1. Transport curves of liquid from the side of water to the side of salt 

 solution through collodion-gelatin membranes of pH 3.0. Abscissae are the 

 concentration of salt, ordinatcs the rise in mm. of level in manometer in solution 

 after 20 minutes. Notice the difference between the transport curve for cane- 

 sugar and those for NaCl, CaC^, and CcCls. 



