DIFFEREXCES BETWEEN NUCLEI AND MUCIN. V/d 



it (though differing from it, as described by Eichwald) in givinj^ 

 a turbidity or slight precipitate with tannin, chloride of iron 

 and sulphate of copper. It differs from mucin in being in- 

 soluble in lime or baryta water, or in HCl of 10 per cent. Its 

 most remarkable reaction is the change it undergoes by the 

 addition of a very small quantity of caustic potash to the water 

 in which it is suspended. It is then much more closely allied 

 to mucin than to albumin. From the solubility and reactions 

 of mucin being somewhat variable it is not improbable that, 

 like albumin, it may occur in several forms, of which this 

 may be one ; but its composition and relations nmst be deter- 

 mined by analyses, which I hope at a future period to be able to 

 make. 



