520 



500 



480 



460 



440 



420 



400 



380 



360 



340 



320 



300 



280 



260 



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220 



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180 



160 



140 



120 



100 



80 



60 



40 



20 



8192 40^ E048 10Z4 512 E56 128 64 32 16 "B" "¥ T 



Concentration 



in 



Fig. 3. Curves representing influence of concentration of five different sodium 

 salts upon initial rate of diffusion of water through a collodion membrane from 

 pure solvent to solution. Abscissae are the logarithms of concentration. Ordi- 

 nates represent level of solution in manometer tube after 20 minutes. The curves 

 rise steeply until the concentration of m/256 is reached, then, with further 

 increase in concentration, the curves drop, and rise again when the concentration 

 is between m/16 and m/4. 



177 



