THE VALENCY RULE AND THE HOFMEISTER SERIES 75 



osmotic pressure at the same pH and the same concentration of 

 originally isoelectric gelatin; while under the same conditions Ba 

 and Ca gelatinate have an osmotic pressure less than one-half of 

 that of the metal gelatinates with monovalent cation. 1 The same 



pH 4 567891011 



FIG. 18. Curves of the osmotic pressure of NEU, Na, and Ca albuminate 

 at different pH. The curves for NEU and Na albuminate are practically 

 identical. 



is true in the case of the metal salts of crystalline egg albumin. 

 Figure 18 shows that the curves for the osmotic pressure of NH 4 

 and Na albuminate are about the same for the same pH while 

 that for Ca albuminate is about half as high. 

 1 LOEB, J., J. Gen. Physiol., vol. 3, p. 85; 547, 1920-21. 



