JACQUES LOEB 



711 



not the case. In Fig. 7 are given the curves for the specific conduc- 

 tivity of 2.4 per cent solutions of gelatin chloride, sulfate, and oxalate 

 after deduction of the specific conductivity of the free acid in the 

 gelatin solution, as described in a previous paper. A comparison 

 between Fig. 7 and Fig. 1 fails to show any close similarity. In the 

 conductivity curves there is no maximum followed by a drop at pH 

 3.5, as there is in the osmotic pressure curves. Fig. 8 shows that the 



14 

 13 

 12 

 11 

 10 



9 



8 I 1 \ \ 1 \ 1 1 \^ — I \ \ 1 1 1 200 



^« 1 1 1 Urmf w #i - 



5 

 4 



o 



X 



u 



g 



u 

 u 



u 



& 



125 w 



u 

 o 



o 



100 

 75 

 50 

 25 







pH 2.0 22 24 2j5 28 3.0 3.2 3.4 3.6 38 4.0 42 44 4.6 4£ 5i0 



Fig. 8. Comparison of conductivity curve and osmotic pressure curve for albu- 

 min chloride, showing the entirely different character of the two curves, 



difference between the conductivity curve and the osmotic pressure 

 curve is still more pronounced in the case of albumin chloride. 



Manabe and Matula,^ who claim to have proved Pauli's theory, 

 speak of a maximum of the physical properties of protein solutions 

 at pH 2.0 or 2.1. There seems to be some misunderstanding, since 

 the maximum for osmotic pressure of solutions of protein-acid salts; 



^ Manabe, K., and Matula, J., Biochem. Z., 1913, Hi, 369. 



