PATENT FOR PURIFIED QUINOIDINE, ETC. 
45 
ART. XTII. — EXTRACT FROM A PATENT FOR PURIFIED QUI- 
NOIDINE, AMORPHUS QUININE. AND BASIC EXTRAC|OF 
BARK. 
[The first part of the specification granting the powers, 
&c, is omitted.] 
Preparation of Purified Quinoidine or Chinoidine. — I 
take three pounds of the residue of quinine manufacture, 
termed chinoidine (which should be soluble in alcohol and 
in dilute sulphuric acid, and insoluble in water.) Nine 
ounces by measure of concentrated sulphuric acid diluted 
with one gallon of water, and dissolving the chinoidine 
therein, I then pass sulphuretted hydrogen through the so- 
lution for nine hours, for the purpose of precipitating metal- 
lic matters and other impurities. The mixture is then to be 
filtered through paper or other suitable material, as is well 
understood by chemists; it is then boiled to drive off excess 
of sulphuretted hydrogen, and an alkali or alkaline carbo- 
nate added, to precipitate the chinoidine. I use commonly 
for the above named quantity, three pounds of carbonate 
of soda, dissolved in one gallon of distilled water. The pre- 
cipitate obtained is then to be well washed with distilled 
water, and dried over a water-bath; towards the conclusion 
of the drying, and in order to dry it more effectually, I 
place it in a chloride of calcium bath, and heat it a few de- 
grees higher than 212°. It is then reduced to powder, and 
kept in well-closed bottles. This purified chinoidine may 
also be kept in solution in alcohol or other vehicle, or made 
into saline compounds. I prefer to sell it in a state of pow- 
der, it being more convenient in that form. I also prepare 
various saline compounds of purified chinoidine, by taking 
at the rate of one-twelfth less than of the amorphous quinine 
hereafter explained, and mix it with acids as hereafter ex- 
plained in respect to amorphous qninine. In some cases 
