ON ALKALOID IN CITRATE OF IRON AND QUININE. 
283 
ture of 60° it did not appear to attract any moisture. It dissolved readily in 
water, yielding a yellow solution wliicli was not quite clear and liad an acid 
reaction upon test paper. It was slightly sweetish to the taste at first, and 
afterwards bitter. The precipitate thrown down by ammonia was brown 
when dry, and difficult to remove from the paper. From three analyses of 
twenty-five grains each I obtained 2*32, 2*32, and 233, mean 2323, equal to 
9‘292 per cent, of quinine, or, 14‘518 per cent, of citrate of quinine. 
This, when treated with ether, yielded a brownish-yellow solution, and left 
only a small quantity of insoluble matter. Ho name appears on the label, 
but the preparation is certified to contain 25 per cent, of citrate of quinine. 
Ho. 9 occurred in rather small scales of a golden-yellow colour. Exposed 
to the air at a temperature of 60°, the scales adhered slightly to each other. 
It was readily dissolved in wate.r, yielding a solution of a yellow colour, but 
not quite clear, and having an acid reaction on test paper. It was more bitter 
than the preceding, but not chalybeate to the taste. The precipitate by am¬ 
monia had a dark resinous appearance when dried. From three analyses of 
twenty-five grains each I obtained 2 - 8, 2 - 8, and 2*83, mean 2*81, equal to 
1T24 per cent, of quinine, or, 17'56 per cent, of citrate of quinine. 
This, when treated with ether, yielded a darkish-coloured solution, and left 
but a small quantity of insoluble matter. The maker’s name appears on the 
bottle, and the preparation is certified to contain 25 per cent, of citrate of 
quinine. 
Ho. 10 occurred in small scales of a brownish-yellow colour. Exposed to 
the air at a temperature of 60°, it underwent no change. It dissolved readily 
in water, yielding a clear orange-yellow solution which, had an acid reaction 
on test paper. It was not chatybeate to the taste but more bitter than the 
preceding. The precipitate by ammonia, when dry, was dark and resinous. 
From three analyses of twenty-five grains each I obtained 3’07, 3'06, and 3‘07, 
mean 3'066, equal to 12 - 26 per cent, of quinine, or, 19T62 per cent, of citrate 
of quinine. 
This, when treated with ether, yielded a solution precisely like that of Ho. 
'9 as regards colour, and left but little insoluble matter. The label bears the 
manufacturer’s name, and certifies the preparation to contain 25 per cent, of 
citrate of quinine. 
Ho. 11 had bright golden-coloured scales, with a tinge of olive-green, and 
rather darker in colour than specimen Ho. 2. Exposed to the air at a 
temperature of 60°, it underwent no change. It dissolved readily in w T ater, 
yielding a clear yellow solution, which had an acid reaction on test paper, and 
a bitter but not chalybeate taste. The precipitate thrown down by ammonia, 
when dried, was of a light colour and resinous appearance. From three ana¬ 
lyses of twenty-five grains each I obtained 3'22, 3'24, and 325, mean 3"236, 
equal to 12'94 per cent, of quinine, or, 2022 per cent, of citrate of quinine. 
This, when treated with ether, yielded a solution a trifle darker in colour 
than the preceding, and left but a very small quantity of insoluble matter. 
Stated on the label to contain 25 per cent, of citrate of quinine. 
Ho. 12 was of a bright golden-'vellow colour and in nice scales. Exposed 
to the air at a temperature of 60°, it became somewhat damp and lost its lustre. 
It dissolved readily in water, yielding a yellow solution which was not quite 
clear, and had an acid reaction on test paper. Its taste was bitter but not 
chalybeate. The precipitate thrown down by ammonia was dark in colour, 
and difficult to remove from the filter when dry. From three analyses of 
twenty-five grains each I obtained 3 - 7, 3'65, and 3‘69, mean 3'68, equal to 
14-72 per cent, of quinine, or 23 per cent, of citrate of quinine. 
This, when treated with ether, yielded a darkish-brown solution as in the 
preceding, and left only a small amount of insoluble matter. The name ap- 
