224 
BRITISH PHARMACEUTICAL CONFERENCE. 
No. 7 contaitied <*372 per cent, of alkaloid, which, if pure quinine, would re¬ 
present 11*518 per cent, of the citrate. This sample, however, contained only 
a mere trace of quinine, the great proportion of alkaloid being quinidine , which 
erysta lized out from the ethereal solution. I have reason to believe that cincho- 
completed° CCUrS ^ ^ Sample ’ but m y investigation is not yet satisfactorily 
IMo. <8 contained 9'292 per cent, of alkaloid, which, were it quinine, would re¬ 
present 14*518 per cent, of the citrate; but, in this case also, it consisted of 
quinidine, with only a mere trace of quinine. No cinchonine could be detected. 
JNo. 9, containing 11*24 per cent, of quinine (equal to 17*56 per cent, of the 
at 1 i x'’ AVaS . - e ^ rom quinidine and cinchonine. The same remark applies to 
No. 10, containing 12*26 per pent, of quinine (equal to 19*162 per cent, of 
0 ^ 99 ^’ and , t0 ??’ containing 12*94 per cent, of quinine (representing 
20*22 per cent, of the citrate). 1 * 
12 ’ c ® ntainil ?g 14 ' 72 pen cent, of quinine (equal to 23 per cent, of 
citrate), a small quantity of quinidine was found, but no cinchonine. 
traces of quinidine , but none of cinchonine, were also detected in No. 13, con- 
taining 14*784 per cent, of quinine (equal to 23*09 percent, of citrate); in 
No. 14, containing14*88 per cent, of quinine (representing 23*25 per cent, of 
citrate) ; and m No. 15, containing 15*84 per cent, of quinine (representing 
24*75 per cent, of the citrate). 
It had been my intention to have completed the subject in this paper by esti¬ 
mating the quantity of iron contained in each sample, but I have been prevented 
doing so by indisposition, and must therefore postpone it to a future period. I 
subjom the resuit of my examination of nine more examples, seven of which 
Attfield’ 18 ’ 19 ’ ^ 22 ' and 2 ^ were kindly forwarded to me by Dr. 
No. 16. This specimen had become damp, and had run into a mass of a dark 
ohve-green colour. It dissolved readily in water, yielding a solution of a green¬ 
ish-yellow colour, and somewhat turbid. It had an acid reaction upon test- 
paper, and possessed only a very slight bitter taste. The precipitate, by ammo¬ 
nia, when dry, was of a brownish colour, with a slight whitish bloom upon it, 
closely adherent to the paper, and in small quantity only. 
As this specimen was difficult to remove from the bottle in which it was con- 
amed, and I had a very small quantity of it only, I operated upon the whole, 
which weighed 62 grams, and obtained 1 grain of quinine, or 1*603 per cent, 
equal to 2*504 per cent, of the citrate of quinine. This had merely a private 
i a k e ^ and was one of the samples forwarded to me by Dr. Att- 
lie xr dlssolved entirely in ether, yielding a pale yellow solution. 
,, JNo * / 7 AT°^ U , rr 1 ed m tlie for . m of gulden-coloured scales, much resembling 
those of No. 24, but not so bright, being covered with a slight bloom. Ex¬ 
posed to the air at a temperature of 60°, they absorbed moisture, and ran into a 
gum-libe mass firmly adherent to the paper on which they were placed. This 
specimen dissolved readily in water, yielding a clear yellow solution which had 
an acid reaction upon test-paper, and was less bitter to the taste than either of 
he other specimens, except No. 16. The precipitate by ammonia, when dry, 
s liank to a mere nothing ; it had a yellowish-brown colour, and was completely 
ad icrent to the paper. From two analyses of twenty-five grains each, I ob¬ 
tained 0*68, 0*68, equal to 2*72percent, of quinine, or4*25 per cent, of citrate of 
quinine. \\ lien treated with ether it was entirely dissolved, yielding a solution 
of a very pale colour. This preparation is stated upon the label, “to contain 
, P e f, cent * of citrate of quinine,” and it was also “ verbally guaranteed to 
the label' 7 1Gn P llrc iased * ,Jdie name of the maker, however, is omitted upon 
No. 18 occurred in fine golden scales, much resembling those of No. 24. Ex- 
