316 NEWTON BALDWIN GREEN 



certain electrolytes. Moreover these electrolytes may be classi- 

 fied into three groups as regards their effect upon one another in 

 relation to this precipitate, said effect being due to antagonism 

 between unadsorbed + and — ions. 



Summary of Part II 



Determinations of electrical resistance were made of solutions 

 of gelatine to which had been added salts in varying concentra- 

 tions. The purpose of these detenninations was to show whether 

 electrical resistance varies directly with the precipitability of the^ 

 gelatine as detennined by Fenn. 



The electrical resistance of the gelatine was found to vary 

 directly with the precipitability, which is greatest at the iso- 

 electric point. 



The isoelectric point occurs when the unadsorbed -f- and — 

 ions of the added salts balance one another. 



It is assmiied that balanced solutions owe their effectiveness 

 to the fact that the protoplasm adsorbs from them equal numbers 

 of + and — ions thus bringing the condition to the isoelectric 

 point, at which there is greatest ionization of the protein, greatest 

 amount of precipitate and greatest (or normal) permeability. 



