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BIO-CHEMICAL JOURNAL 



less of the dye is contained in the paper and more in the solution. 

 The curve (Fig. 5) shows the results of a few observations at various 

 temperatures, ordinates being percentages in paper and abscissae tem- 

 peratures. It will be noted that a straight line is formed. The values 

 at the lower temperature are not quite so accurate as at the higher, 



FIG. 5 



since the former were obtained by allowing the flasks to stand in the 

 laboratory, the temperature of which was not constant within 2 or 3 

 during the time necessary for equilibrium to establish itself. The 

 upper values are accurate, being taken in a thermostat. 



Attention has already been directed to the length of time necessary 

 at low temperatures for the establishment of equilibrium in these dilute 

 solutions. Ostwald also notes this fact. 1 



The dissociation of adsorption compounds by raising the tempera- 

 ture can also be shown in the case of gelatin and inorganic electrolytes, 

 though complicated in this instance, by the passage from the state of 

 hydrogel to that of hydrosol. There is, however, as I find, no sudden 

 change in passing from the one state to the other as regards conduc- 

 tivity. If one warms a gelatin hydrogel from 15 to 40 determining 



i. Loc. cit. t p. 1093. 



