94 



ELECTRIFICATION OF WATER AND OSMOTIC PRESSURE 



ments were made at a constant temperature of 24°. The two figures 

 show that water diffuses more rapidly into Li and K gelatinate than 

 into Ba and Ca gelatinate. Na and NH4 gelatinate behaved like 

 Li and K gelatinate. The pH of the gelatin solutions was 8.2 in this 

 experiment. 



A second method of testing the influence of different metal gelati- 

 nates upon the rate of diffusion consisted in determining that concen- 

 tration which a cane sugar solution must have in order to balance 



ISO 



20 

 10 



5 10 15 20 25 30 55 40 45 50 55 60 65 70 75 60 



Time in minutes 



Fig. 1. Curves of fall of level of water when diffusing under an initial pressure 

 head of about 120 mm. of H2O against 1 per cent solutions of Ca and K gelati- 

 nate (pH = 8.2). 



the attraction of a 1 per cent solution of metal gelatinate for water. 

 The procedure was as follows. 350 cc. of a 1 per cent solution of a 

 metal gelatinate, e.g. Na gelatinate, of pH 7.0 were put into each 

 of a series of beakers and into each beaker was put one of the collodion 

 flasks filled with a different concentration of cane sugar varying from 



