rn,iconcenirdiion § le 3z 64 izs 256 5ii i024 2046 4096 n,(r "^^ 

 pti ae J.6 3.7 i6 4.1 47 5.Z 5.6 6.^ 6.6 71 70 



Fig. 3. Ca(N03)2-HCl curves. Minima of all curves again at pH =4.7 

 (isoelectric point). The branches of the curves for osmotic pressure, swelling, and 

 alcohol number on the left, where gelatin exists as mixture of gelatin CI and 

 gelatin nitrate, higher than the branches on right of the isoelectric point, where 

 gelatin exists as calcium gelatinate. 



50 



