JACQUES LOEB 



95 



m/1 to m/64. It was useless to go below a concentration of m/64 of 

 cane sugar since this was about the lowest concentration at which 

 cane sugar influenced the rate of diffusion of water. The level of 

 the cane sugar solution in the manometer tube was about 25 mm. at 

 the beginning of the experiment. When the water diffused more 

 rapidly from gelatin to cane sugar than in the opposite direction, the 

 level in the manometer rose, when the water diffused more rapidly 



120 



^ 



Q 



^ 

 J 



60 

 50 



^ 40 



30 

 20 

 10 



5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 



Time in minutes 



Fig. 2. Curves of fall of level of water when diffusing under an initial pressure 

 head of about 120 mm. of H2O against 1 per cent solution of Ba and Li gelatinate 

 (pH = 8.2). 



from cane sugar into gelatin than in the opposite direction the level 

 in the manometer tube fell. Between the two was a concentration 

 where the rate of diffusion in both directions was the same and this 

 concentration of cane sugar we called the balancing concentration of 

 cane sugar. Such experiments are only of value when of short du- 

 ration on account of the fact that the sugar diffuses out into the gelatin 



