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rnnr nill^ItllllllllMrillllM 

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42 4.05 3.9 38 3.7 3.5 3.4 3.3 31 



Fig. 3. Showing difference in osmotic behavior of collodion membranes treated 

 and not treated with gelatin. Membranes separating solutions of AI2CI6 from 

 pure water. Upper curve, initial rate of diffusion of water (first 20 minutes) into 

 solution through membranes treated with gelatin; lower curve, diffusion of water 

 during the first 20 minutes into same solution of AI2CI6 through membranes not 

 treated with gelatin. In second case only the gas pressure effect of solution is 

 apparent, while electrical attraction of water by solution is lacking. 



260 



