SELECTED ARTICLES. 25 
impressions perceptible upon the younger pieces. The epi- 
dermis is formed of laminae applied one upon another, of a 
deep brown colour, containing between them a reddish pul- 
verulent substance, intermixed with white fibres. It must 
here be remarked that the colour of the laminae is deeper 
than that of the interposed pulverulent matter, because this 
character distinguishes the Calisaya, in large unpeeled pieces, 
from all others. Thus the wartless red bark in flat pieces, 
apart from the red colour of its liber, resembles to an astonish- 
ing degree, the unpeeled flat Calisaya ; but the epidermis is 
formed of grayish laminae which enclose a pulverulent sub- 
stance of a bright red colour, and the bark presented by M. 
A. Delondre, which is a kind of ligneous Columbia bark, is 
provided with an epidermis formed of micaceous white laminae, 
containing a red pulverulent substance, and where this sub- 
stance is wanting, the liber is simply covered with a thin 
white micaceous layer, which is entire and without fissures. 
This bark ought to be pointed out to pharmaceutists, because 
skilful dealers, who pretend to pass for honest men, colour it 
red, either by a weak alkaline solution, or with an infusion of 
logwood, and pass it for red bark. We have seen such an 
article in the possession of a number of pharmaceutists during 
the past year. 
It now remains for me to speak of the peeled Calisaya 
bark. The best is that which is quilled, compact and heavy. 
That which is in large flat pieces is of an inferior quality. In 
addition, this bark is always very fibrous, of uniform texture, 
and in every part of a yellow colour. Its external surface is 
angular, or as it were, compressed irregularly. Every kind 
of bark which exhibits a more fibrous texture internally than 
externally, which is marked with two distinct colours, a whitish 
hue internally and a reddish tint externally; finally, every kind 
which presents a well defined, uniform, regular exterior surface, 
is to be suspected. Such a variety of bark may, however, 
be extremely active as a medicine, and contain much of the 
alkali. Such are those justly esteemed which I have de- 
VOL, III. NO. 1. 4 
