56 



AMPHOTERIC COLLOIDS. 



fWlrnnr^ntMrmn ^ HH iLUJL-Q-iLJLJLJL NaoH „„ 

 nnu«,cmratiun ^ le 3Z 64 i^a Z56 5IZ 102(1 2W6 4096 mi h;,0 "i" 



pfl 56 37 17 Jii 42 4& a6 6£ W Si6 9.0 9.0 70 



Fig. 5. m/32 NaOH followed by HCl treatment. Minima at pH = 4.8 

 (isoelectric point). Branches of curves on left side almost identical with those of 

 Fig. 1 (where HCl alone was appHed). On the left side of isoelectric point 

 gelatin exists as gelatin chloride, on the right side as sodium gelatinate. 



