QUANTITY OP ALKALOID IN CITRATE OP IKON AND QUININE. 225 
posed to a temperature of 60°, it absorbed moisture and became adherent to the 
paper upon which it was placed. It dissolved readily in water, yielding a yel¬ 
lowish solution which had an acid reaction upon test-paper, and possessed but 
slight bitterness, as most of the others. 
The precipitate yielded by ammonia was not very copious. It had, when 
dry, a light brownish colour, with a faint white bloom over the surface, and 
firmly adhered to the filter. 
From two analyses of twenty-five grains each, I obtained 0*69, 0-73 ; mean 
r P /-’ e( l ua ^ ^9 ~ P er cent, of quinine, and 4*437 per cent, of citrate of quinine. 
I ms was entirely soluble in ether, yielding a solution of a very pale colour. 
No. 19. This specimen consisted of very small scales of a dull olive-yellow 
colour. Exposed to the air at a temperature of 60°, it remained unchanged for 
a considerable time, but ultimately absorbed moisture and became adherent to 
the paper upon which it was placed. It dissolved readily in water, yielding a 
clear yellow solution, which had an acid reaction upon test-paper, but possessed 
but little bitterness. Only a small quantity of precipitate was thrown down by 
ammonia, which, when dry, very much resembled that immediately preceding 
it, being of a light brown colour, with a white bloom over it, and closely adherent 
to the filter. 
From two analyses of 25 grains each, I obtained 1-06, 1*03; mean 1*045, 
equal to 4T8 per cent, of quinine, and 6*531 per cent, of its citrate. 
It dissolved entirely in ammonia, yielding a pale yellow solution. 
NTo. 20 occurred in small granules, and it appeared as if it had been damp 
% an(a h a d run together, and been afterwards dried. It had a very dark olive 
colour, approaching a blackish hue. Exposed to a temperature of 60°, it re¬ 
mained unaffected. It dissolved readily in water, yielding a yellowish solution, 
which was slightly turbid. It had an acid reaction upon test-paper, and a 
bitter taste, but of much less intensity than that of Nos. 22 and 23. The pre¬ 
cipitate by ammonia, when dry, was not very bulky ; it had a very dark colour, 
and separated very readily from the filter. 
From two analyses of 25 grains each, I obtained 1*12, 1*09;* mean 1T05, 
equal to 4*42 per cent, of quinine, and 6*906 per cent, of its citrate. 
It was almost entirely soluble in ether, yielding a solution of a yellowish 
colour, but less deep than the two preceding ones. 
No. 21. This sample was composed of small granules of a dark olive-brown 
colour, intermixed with a few small scales of a somewhat lighter colour. Had 
apparently got damp and been dried. Exposed to the air at a temperature of 
60°, it remained unchanged. It dissolved readily in water, yielding a solution 
of somewhat deeper colour than either of the preceding, slightly turbid, having 
an acid reaction upon test-paper and an intensely bitter taste, but not chaly¬ 
beate. With ammonia it yielded a copious precipitate, which, when dry, had a 
dark-brown colour with a white bloom, and a very resinous appearance. From 
two analyses of 25 grains each, I obtained 3*25, 3*22; mean 3*235, equal to 
12*94 per cent, of quinine, and 20*218 per cent, of its citrate. This was almost 
entirely soluble in ether, and the solution closely resembled those of Nos. 22 and 
23 in colour. 
No. 22. This consisted of bright golden-coloured scales, rather darker in 
colour than No. 24. Exposed to the air at a temperature of 60°, it was un¬ 
affected. It dissolved very readily in water, yielding a somewhat turbid 
yellowish solution with an acid reaction upon test-paper, and a strongly bitter 
taste, but was not very chalybeate. The precipitate thrown down by ammonia 
was copious, and when dried had a brownish resinous appearance, its surface 
being covered with a white bloom, and was readily separable from the filter. 
From two analyses of 25 grains each I obtained 3*46, 3*54 ; mean 3*5, equal to 
14 per cent, of quinine, and 21*87 per cent, of its citrate. It was almost en¬ 
tirely soluble in ether, yielding a yellowish solution. 
