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Related article:
366 REPORT ON THE PROGRESS OF PHARMACY.
Pharmacopcjeias, and they all demand that 5 Cc. filtrate should require a
specified minimum quantity of 10 per cent, ammonia solution to clear up
the precipitate occasioned by such addition : U. S., 7 Cc. ; French, 5 Cc. ;
Dutch, 4.5 Cc, and German, 4 Cc, as a minimum. The author's experi-
ments, Buy Kamagra Uk the details of which must be consulted in the original, lead him to
the conclusion that the method of applying the ammonia test to quinine
sulphate, as described by the French Pharmacopoeia, is to be preferred to
that given by the other pharmacopoeias, but that the standard of the
French, as well as of the German and Dutch Pharmacopoeias, are too
stringent, and that a minimum of 6.0 Cc. when conducting the test ac-
cording to Buy Kamagra Uk the French method would seem a reasonable requirement.
The usefulness of the ammonia test is, however, limited, and the author
therefore questions whether the test of the British Pharmacopoeia, for cin-
chonine and cinchonidine by means of purified ether, etc., is not to be pre-
ferred. Pharm. Joum. and Pharmacist, Nov. 13, 1909, 603.
Quinine Tan nates True and False Kinds. Buy Kamagra Uk Biginelli points opt the
distinction between true quinine tannates, which are definite chemical
compounds, and false quinine tannates, which are simply addition-products
of tannin with quinine salts used for precipitation. In the latter, for ex-
ample, the sulphuric acid derived from the quinine sulphates used maybe
determined in the hydrochloric acid solution of the sample.
Taste/ess Quinine Tannaie he now finds to be a mixture of four true
quinine tannates, namely : Tetraquinine Pentannate, Biquinine Tritan-
nate, Biquinine Tetratannate and Biquinine Pentannate. The true Buy Kamagra Uk
quinine tannates must respond to the following reaction : If o.i to 0.2 is
moistened with moderately strong hydrochloric acid, then diluted afler a
few minutes with 2 to 3 Cc of water and evaporated to dryness, the
residue of evaporation should be soluble in 20 Cc. of water. Pharm. Ztg.,
liv (1909), No. 7^, 726; from Gazz. Chim. Ital.
Quinine and Urea Hydrochloride Properties. In view of the impor-
tance Buy Kamagra Uk quinine and urea hydrochloride has recently gained as a local
anesthetic and the paucity of information regarding this compound, George
L. Schaefer makes Buy Kamagra Uk some practical observations concerning its properties
and gives some tests for its identification and purity. Theoretically this
salt requires 50.2.^ per cent, anhydron quinine, 10.98 percent, urea, 13.32
per cent, hydrochloiic acid, and 16.46 per cent, water, but the preparation
on the market usually contains 2 to 3 per cent, less of water of crystalliza-
tion than is required by the formula : C2oH24N202(HCI).j -f CO(NH,), -|-
5H2O. It crystallizes in hard and nearly colorless prisms from water and
from alcohol in soft, needle-shaped crystals, but for convenience is usually
supplied in form of a white powder, soluble in its own weight of water
and in 2.5 parts of alcohol. Soluble in chloroform, but partly decom-
posed thereby ; practically insoluble in ether. By prolonged heating at
Digitized by VjOOQIC
GUANIDINE PERCHROMATE. 367
i25*C. the salt becomes anhydious, and then mehs almost completely at
180

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