THE VALENCY RULE AND THE HOFMEISTER SERIES 73 



of originally isoelectric gelatin with six different acids, HC1, 

 H 2 SO 4 , acetic, monochloracetic, dichloracetic, and trichloracetic 

 acids plotted over pH as abscissae. 1 Since the concentration of 



340 

 320 

 300 

 280 

 260 

 240 

 220 

 200 

 180 

 160 

 140 

 120 

 100 

 80 

 60 

 40 



20 

 





/ 







Gelatin sdlfa 



iilcrao&at 



ichloFaceta 



chlora:eta;e 



\ 



pH 2.0 2.2 24 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 42 4.4 46 



FIG. 17. Osmotic pressure (in mm. BUG) of about 0.8 per cent solutions of 

 gelatin chloride, gelatin acetate, monochloracetate, dichloracetate, and tri- 

 chloracetate. The curves are practically identical. 



the originally isoelectric gelatin in these solutions was lower than 

 in the experiments represented in Fig. 14 (about 0.8 per cent 

 instead of 1 per cent) , the osmotic pressures are also all lower, but 

 the results are relatively the same. Thus the maximal osmotic 

 1 LOEB, J., J. Gen. PhysioL, vol. 3, p. 85, 1920-21. 



