ISO 
ON A VARIETY OP CINCHONA BARK. 
lysis, as well as the aspect qf the drug itself. The seroons 
are of the usual size, weighing about 160 pounds, covered 
with raw hide. The bark is in pieces varying from three or 
four to ten or fifteen inches in length, two to four lines in 
thickness and various breadths, generally in narrow flattened 
pieces occasionally in rolled or quill form, and portions broken 
up by attrition or packing. The exterior surface varies in dif- 
ferent pieces to a considerable degree. A very fine speci- 
men in my possession has the reddish-brown epidermis re- 
maining on parts of the surface which is fissured both trans- 
versly and lengthwise, with several lichenoid spots of a 
whitish colour. Where the epidermis has been removed, 
the colour is a uniform yellowish brown, somewhat orange, 
marked with scar-like impressions, as if the exterior bark 
had been pealed off by a natural process. The interior 
surface has a brighter colour, is smooth and the fibres are 
straight, and not interlaced, as often observable in calisaya. 
In other pieces the external surface retains nearly the ' 
whole epidermis, which is thin and of a greyish brown hue, 
whilst the interior surface has a dull ochre colour, having 
evidently less of the red colouring matter. The fracture of 
all the specimens exhibits yellow translucent spiculse analo- 
gous in appearance to those of calisaya, but less numerous, 
and not capable of penetrating the skin like those of the lat- 
ter bark, which is one of the best criteria for distinguishing 
them. The edge of the bark presents the crystalline points 
like the calisaya, which are less numerous. All parts of 
the bark are decidedly bitter, accompanied at first with an 
acid impression, and the odour is analogous to calisaya. 
Chemical Examination, — 1000 grains of the bark in 
question taken from a number of the pieces was exhausted 
by water acidulated with muriatic acid, and the clear hot 
infusion was precipitated with a slight excess of milk of lime ; 
the precipitate, thoroughly washed and dried, weighed 
