Observations and Experiments on Perurman Bark. 33 
2nd. Calisaya Plancha, (Flat Calisaya.) This variety con- 
sists 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 twenty to 
twenty-five per cent less quinine than the arrollenda, and is 
conaempently. a less desirable article. 
Superior Loxa or Crown Bark. 
Loxa is the name of the province and port, where this 
bark is obtained and from which it is exported. In. this 
province cinchona was originally discovered. This bark 
has been highly esteemed by the royal family, and is that 
which has been selected for their use ; hence, .the name of 
Crown Bark. The following are the characters which dis- 
tinguish this bark. 
e Loxa bark occurs in small quills, the longitudinal 
edges folding in upon themselves forming a tube about. the 
circumference of a goose quill, and from half a foot toa foot 
and a half in length. It is of a greyish colour on the ex- 
terior, and covered with small transverse fissures or cracks, 
the interior surface is smooth and in fresh or good bark of a 
bright orange red, it is of a compact texture and breaks with 
a short clear fracture, it is the bark of the cinchona conda- 
minia and is known at Loxa by the name of cascarilla fina. 
Yet, notwithstanding this bark appears to have held the de- 
cided preference to all other species, analysis fully indicates 
that it is not panne in medicinal strength by at least twenty- 
five per cent, to that denominated Calisaya; this bark is more 
nt ess bitter than the calisaya. 
This species yields from twenty-five to thirty per oan less 
cinchonine and quinine, than the caylisaya arrollen oe 
quinine, and the sik doles, of cinchonine is much pi 
than that of the quinine 
Caieus Oblongifolia or Red Bark. 
rior red bark of ee there is a considerable quantity in our 
Vor. XVIL—No. 5 
