JACQUES LOEB 



197 



the concentration of m/62 a further addition of K4Fe(CN)6 lowers the 

 rate of diffusion of water into the solution. From this concentration 

 on the repelling action of the K and Na ions upon water prevails over 

 the attractive action of the anion. 



20 



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ei92 4096 204« 1024 512 256 128 64 32 16 8 4 2 



Concentration 



m 



Fig. 15. Curves showing that when we add increasing concentrations of NaNOs, 

 Mg(N03)2, and Na2S04 to m/ 512 solutions of AI2CI6 the depressing effect is greater 

 for SO4 than for NO3. Since the water diffuses in this case in the form of nega- 

 tively charged particles the curves support the idea that the depressing effect of 

 the salt added is due to the repelling action of the anion upon the negatively 

 charged particles of water. 



When the collodion flask (previously bathed in gelatin) is filled 

 with m/512 AI2CI6 and dipped into a beaker with distilled water, water 

 diffuses at first very rapidly into the flask. The water is in this case 

 negatively charged and attracted by the Al ion and repelled by the 

 anion. When we add small quantities of a salt with bivalent anion, 

 e.g. Na2S04, to the AI2CI6 solution the attraction of the AI2CI6 solution 

 for water is diminished more rapidly than when we add a salt with a 



