198 
OXYGEN ON ORGANIC BASES, 
white odorous vapors, containing no ammonia ; it inflames, 
burns with a fuliginous flame, and leaves, as a residue, 
charcoal which is very difficult to incinerate. 
Cinchonine dissolves more easily in boiling water than 
in cold water. Its best solvent is alcohol. Ether has no 
action on it. Concentrated sulphuric acid very readily dis- 
solves it with a red color, and without appearing to make 
it undergo any alteration. If this solution be diluted with 
water, it assumes a yellow tint, and is not turbid. 
The aqueous solution of cinchonetine, which is colored 
red, does not become turbid under the influence of ammo- 
nia or potassa, but_, by its contact with these reagents, it 
assumes a purple color, which afterwards passes to fawn 
yellow, and the acids cannot restore to it its primitive color. 
The subacetate of lead occasions in this solution (which 
chlorine instantaneously deprives of color) a violet precipi- 
tate, which is deposited in a few moments. 
Cinchonetine may, in contact with peroxide of lead, and 
under the influence of sulphuric acid, be converted, by aid 
of heat, into new colorless compounds, among which it ap- 
pears acetic acid may be reckoned. 
PRODUCTS DERIVED FROM QUININE. 
The result of the action exerted by the nascent oxygen 
on this organic base, as a complex matter which acts under 
the influence of heat, in a manner analogous to cinchone- 
tine, and which may be separated into at least two distinct 
principles, quinetine and modified quinetine. The first of 
these bodies is that which remains when the complex co- 
loring matter is treated by water: it is insoluble in this 
liquid, but it dissolved in alcohol, to which it imparts a vio- 
let color. Modified quinetine is, on the contrary, the prin- 
ciple which water dissolves, acquiring a blood-red color. 
Modified Quinetine. 
It is presented under the form of an amorphous mass, of 
a red color, of a bitter taste, soluble in water, alcohol, and 
