Chemical Composition of Human Blood. 121 



Alcohol, red flocky precipitate. 



Infusion of nut-galls, reddish brown precipitate. 



Lime water, ditto. 



Barytes water, ditto. 



Acetic acid, colour becomes brown. 



Sulphuric acid, brown precipitate soluble in excess of acid. 



Muriatic acid, ditto. 



Prussiate of Potash, ditto. 



Bichloride of mercury, flocky precipitate. 



Acetate of lead, ditto. 



When a current of chlorine gas is passed through a 

 strong solution of the hematosine, no effect is produced for 

 some time, but as the bubbles of gas appear on the surface 

 of the solution, they are covered with a white fatty looking 

 matter. Continuing the process, the colour at last com- 

 pletely disappears; and a very dense white precipitate is 

 formed. 



It may be separated by a; filter and washed. 



During the drying it emits a very strong smell of hydro- 

 cyanic acid. 



It has a yellowish colour. 



Is insoluble in water or ether. 



When dry it is only partially soluble in alcohol, from 

 which it is precipitated by warm water. While moist and 

 with a faint smell of chlorine, it dissolves readily in boiling 

 alcohol. On evaporating the solution to dryness nearly 

 the whole volatilizes. » 



Caustic soda changes the colour to a deep yellow, and 

 then dissolves the -whole. The colour of the solution is 

 brown, and the substance appears to be precipitated un- 

 altered on the addition of an acid. 



Muriatic acid has no action upon it, while it dissolves in 

 sulphuric with great facility. 



Dissolves in common nitre with effervescence. 



The solution on evaporation to dryness leaves a viscid 

 yellow mass, in appearance not unlike gelatine. It is par- 

 tially soluble in water, in which solution extract of nut- 

 galls causes a precipitate. The portion insoluble in water 

 while warm is very elastic, similar to caoutchouc, but on 

 cooling becomes quite hard. 



Acetic acid by long continued digestion appears to dis^ 



