288 



COLLOIDS AND ELECTROLYTES 



6 



CD 



CO 



to 



p- 

 o 



CO 



o 



320 

 300 

 280 

 260 

 240 

 220 

 200 

 180 

 160 

 140 

 120 

 100 



80 



60 



40 



20 







rmrHH O-H-iLlLililJliill ilH 

 ■^ 8000 4000 20001000 500 250 125 62 31 15 



pH 485 4.5 44 41 3.6 3.2 2.7 2.4 2.1 1.75 1.5 [after dialljSis] 



pH 47 4.65 4.5 44 4.3 3.95 345 2.7 2.2 1.S 1.8 [befOFG dialL|5i5] 



Fig. 10. 1 per cent isoelectric gelatin solutions dissolved in increasing con- 

 centrations of HCl. Abscissae are the concentrations of HCl in which the gelatin 

 is dissolved, with the pH at the end and at the beginning of experiment. Ordinates 

 of upper curve represent the iinal osmotic pressure (after 20 hours) ; ordinates of 

 lower curve represent the initial rate of diffusion of water into solution. Maximimi 

 in both cases at pH 3.3. Showing the depressing effect of the further addition 

 of HCl when pH 3.3 is reached. 



