36 
ON QUINOIDINE. 
in it. The latterseparated in the form of a beautiful white 
precipitate, which, however, soon conglomerated again. It 
was now washed with distilled water, dried in the water- 
bath and then pulverised; the powder weighed twenty- 
eight drachms, and consisted of very pure amorphous 
quinia. As that part of the amorphous quinia which had 
not been dissolved by the ether still tasted very bitter, 
twenty-four ounces of common ether were again added. 
This acquired a brownish-yellow colour, whilst the undis- 
solved parts changed into a dark-brown liquid of the con- 
sistency of treacle. The ethereal solution deposited after 
some days a considerable quantity of a crystalline mass, 
and left, by evaporation, about ten drachms of a light yel- 
lowish-brown, amorphous, resinous, bitter substance, which, 
being treated with pure ether, separated into almost colour- 
less amorphous quiuia, a considerable quantity of coloured 
cinchonia, and a deep yellowish-brown, resinous, very 
bitter compound. When the latter was treated, according 
to the above-mentioned method, with an equal weight of 
sulphuric acid, a large quantity of pure amorphous quinia 
was obtained from it. That part which had remained un- 
dissolved, after having been treated with common ether, 
was dried in the water-bath, triturated, and mixed with 
diluted acetic acid. By this it was almost all dissolved. 
On the addition of Glauber salt, however, a rather lar<^e 
quantity of a dark-brown substance precipitated from the 
liquid, which, after being dried, possessed scarcely any bit- 
ter taste, and had a greyish-brown colour. The filtered 
acetic solution yielded upon the addition of liquid ammonia, 
a very deep-coloured quinoidine, which gave scarcely any 
trace of amorphous quinia to ether. The compound which 
had spontaneously crystallized out of the solution prepared 
with common ether, was dissolved in spirit of wine of 
eighty per cent., and the solution after being discoloured 
by animal charcoal, was filtered whilst boiling hot. On 
