Preparation of Quinine. 147 
acetate, or more especially with subacetate of lead, a bulky buff- 
eoloured matter is separated, leaving the remaining fluid entirely 
tasteless and colourless. This precipitate was diffused through 
water, and decomposed by sulphuretted hydrogen; it afforded a 
solution of tan and extract, but not any traces of any peculiar 
principle to which certain medical effects of tea, especially of 
green tea, could be attributed.” 
Mr. Brande observes, that there is one property of strong in- 
fusions of tea, belonging especially to black and green, which 
seems to announce the presence of a distinct vegetable principle ; 
namely, that they deposit, as they cool; a brown pulverulent 
precipitate, which passes through ordinary filters, and can only 
he collected by deposition and decantation ; this precipitate is 
very slightly soluble in cold water of the temperature of from 50° 
downwards, but it dissolves with the utmost facility in water of 
100° and upwards, forming a pale-brown transparent liquid, which 
furnished abundant precipitate in solutions of isinglass; of sul- 
phate of iron, of muriate of tin, and of acetate of lead; whence 
it may be inferred to consist of tannin, gallic acid, and extrac- 
tive matter. bs 3 
The following table is given by Mr. Brande as showing the 
respective quantities of soluble matter in water and alcohol, the 
weight of the precipitate by isinglass, and the proportion of inert 
woody fibre on green and black tea of various prices : 
Soluble in/Soluble in} Precipitate |Inert re- 
ie en tethigeey pee water. | alcohol. | with jelly. | sidue. 
Green hyson, 14s. perlb...| 41 44 31 56 
Ditto, 12s. wecccccesse 34 43 29 57 
Dit0, 108. . cons ncseesiel. oO 43 26 57 
a MABSABE ARB G Mie i 42° 25 58 
DUO; 782s cecerscocces| OF 4l 24 59 
Black souchong, 12s. ....) 35 36 28 64 
BE TOS sess ce apeeast OC 37 28 63 
MILD, 7S: ,cccssoesccscs| OO 35 24 64 
SON, so sadn ss.p's,p esl, 200) 31 23 65 
PREPARATION OF QUININE. 
M. J. Voreton, of Grenoble, employs the following method in 
preparing Quinine, by which he says he is enabled to procure 
about two ounces and a half of Quinine from eleven pounds of 
Cinchona, instead of an ounce and a half, or an ounce and three 
quarters procured by the common process, The Cinchona re- 
duced to a coarse powder is to be digested in water, agit ae 
T2 with 
