376 Prof. E. N. Horsford on Gilycocoll, 
From three to four ounces of hippuric acid were digested in a 
flask of one litre* capacity, over a spirit lamp, in four times their 
weight of concentrated hydrochloric acid, until entirely dissolved. 
A larger quantity is less manageable, and the subsequent treat- 
ment less expeditious. It is well to continue a gentle heat, with 
the addition of water half an hour after the solution is completed. 
niac, it is well to let the fluid stand a few hours. ‘The precipl- 
tate is then brought upon a filter and washed with absolute alco- 
sed till the filtrate no longer gives a precipitate with nitrate 
silver. 
Properties of Gilycocoll. 
Thus obtained, hydrate of glycocoll tastes sweet, though less 
so than cane sugar,—has neither acid nor alkaline reaction ; dis- 
solves in from 4-24 to 4:35 parts of water ; is more soluble in hot 
than in cold spirits of wine; is quite insoluble in ether, and 
scarcely less in absolute alcohol. 
When heated with a concentrated solution of caustic potash, 
in excess, it assumes, with the evolution of ammonia, a fine brik 
liant red color. If the heat be continued, the color gradually dis- 
appears. i 
Heated with hydrate of baryta or oxyd of lead, the same bril- 
liant color is produced. Hrs 
With sulphate of copper, a trace of glycocoll prevents the pre- 
cipitation by potash, and the solution assumes a characteristic 
blue color. Boiled with oxyd of copper or its hydrate, 4 Y" 
the tse blue solution, which, if concentrated, crystallizes 10 fine 
needles. 
So 
* <= 0-2201 English gallon. 
