= 
talts formed by the union Of Quina with acids, differ from — 
those of Cinchonia, in a greater degree of bitterness, and. _ 
different proportion of their elements. Quina seems to — 
have less capacity for saturation than Cinchonia—100 parts 
of the latter will unite with 13.021 of sulphuric acid, while _ 
weight of Quina requires more than 10.91 of — 
Bots oS , oe 
Quasrriss. White, incrystallizable ; the salts distinguished 
by a pearly aspect; soluble in ether, insoluble in water. — 
Not used in medicine, sulphate being employed. Forms, — 
. With gallic and oxalic acids, salts as insoluble as those 
_ which the same masses form with Cinchonia. 
Orrtc. Pree. 1. Quine Sulphas—Sulphate of Quinine. This 
iad papeeaic Hol, ell oe tap ope te 
thus prepared : é an hour, two poun : 
approprats bark in powder, in 16 of distilled water, acid-_ 
ulated with two fluid ounces of sulphuric acid—strain the 
decoction through a linen cloth, and submit the residue 
to a second ebullition, in a similarquantity of acidulated — 
water: mix the decections, and add, by small portions at 
a time, powdered lime, constantly stirring it to facilita 
its action on the acid decoction. (Half a pound is ! 
quantity uisite.) When the decoction has Me 
slightly al . it assumes a dark-brown colour, deposit- _ 
ing a reddish-brown flocculent precipitate, which is to be 
separated by passing it through a linen cloth. The pre- — 
cipitate is to be washed with a little cold distilled water, 
and dried: when dry, is to be digested. in rectified spirit, 
with a moderate heat, for some hours: the liquid is then 
to be decanted, and fresh portions of spirit apie, until it 
no longer acquires a bitter taste. Unite the spirituous 
tinctures, and distil in a water bath till 3 of the spirit 
employed be distilled over. After this operation, there 
remains in the vessel a brown viscid substance, covered — 
with a bitter, very alkaline, and milky fluid. The two — 
products are to be separated, and treated as follows: To — 
the alkaline liquid, add a sufficient. quantity of sulphuric 
acid to saturate it: reduce it, by evaporation, to half the 
quantity; add a small portion of charcoal, and after some 
- minutes’ ebullition, filter it while hot, and crystals of Sul- 
hate of Quina will form. These are to be dried in bibu- 
Sous paper. Two pounds of the bark will yield about 5 to 
6 drachms, of which 8 grains are considered equal to an 
ounce of bark. This is the younger Henry’s process, 
modified by Paris. : oe 
Qvatitizs. Crystals remarkable for their satin-like and — 
ly lustre ; soluble in cold water, a property increased — 
y excess of acid. It appears that it is not a true sulphate, — 
VOL. Il. K i 
