_ large pieces, prived of their external coat or 
- epidermis, an s of the cortex altogether, leav- 
_ ing the liber bark. The quills always lave the 
_ epidermis on : 
Mr. George W. 
since out of his appre 
» ayoung man, but a short time 
nticeship with Mr. Charles : 
Market street, con aha druggist business he now assists _ 
in conducting, has very creditably availed himself of the _ 
facilities he has enjoyed in that business, by experimenting 
on the proximate principles yielded by vegetable chemis- 
try. He has handed me the following memoranda of ex- 
periments made by him-on the barks, which he propo 
receding part of his MS. (not here uoted,) to be 
by their provincial names, instead of 
in the 
my lectures, - 
officinal terms, pale, yellow, 
any other— 
bating, as I have done for many years, in 
the absurdity of prescribing them by the 
and red. You will recollect. 
my observations on this subject, last session. I quote his 
experiments from his memoranda :— 
‘The following are some of the most important species 
which now occur in commerce 
e, which I haye submitted to 
experiments, and have given to each the comparative pro- 
portion of Quinine and Cinchonine they respectively con-. 
tain. The names which are given to distinguish these 
several species, are derived from the provinces in which 
they grow. 
& 
CALISAYA BARK—2 varieties :—_ 
1, Calisaya arrollenda, (quill Calisaya.) This variety is in 
Prog ta 3 of an inch to 14 inch in diameter,.and from 
8 inches to 14 foot in length. 
may be readily removed fron 
in the seroons or cases, a g 
inert part. It is 
about 15075, an 
im 
deep transversal fissures, me 
woody and shining; the interior layer fi 
seldom comes 
The epidermis is thick, and 
the bark—hence you find, 
roportion deprived of this 
(DO 
yellow colour. Taste slightly astringent, and very bitter, 
Yields a much larger proportion of the active principle, 
(quinine, ) than any other in commerce, and consequently 
may be esteemed the best. __ 
~ 
2.. Calisaya Plancha, (flat Calisaya. ) This variety consists 
of flat, thick, woody pieces, of a reddish-brown colour, 
__. deprived of its epidermis, and the interior layer more 
_ fibrous than that in the quill. This variety yields from 20 
__ to 25 percent. less quinine than the rrollenda, and is 
consequently a less desirable article. 
