, 



54 PROTEINS IN ISO-ELECTRIC REACTION 



structure as glutin, albumin and casein show such a very 

 close agreement in the value of the iso-electric concentration 

 (2 X io~ 5 ) in acetic acid acetate mixtures. The supposition 

 that, on further combination with acid, a newly-formed posi- 

 tive polyvalent protein ion appears is necessitated by the 

 behaviour of the salts of albumin with acids described in the 

 following chapter. 



