79 
the internal surface has a fibrous appearance, of a yellow colour 
sometimes light and sometimes deep, occasionally reddish ; thick- 
ness from half a line to a line and a half; bulk from half an inch 
to three in circumference ; odour that of the good Quinquinas but 
very slight; bitterness inferior to ‘that of the Calisaya, somewhat 
styptic ad nauseous ; fracture considerably clean on the exterior 
edges of the two pieces ; but entirely ligneous within. This bark 
is tolerably well rolled, sometimes the two sides roll separately 
and unite in the middle. It is thought that the materials and 
observations expected from M. Tafalla ome afford means for 
determining this Species. 
= : : # 
Bis Cascarilla Serruginea (iron-coloured). 
Well characterized by the name which. it bea in commerce, 
having internally and externally the colour of ochre; this co- 
lour is more or less lively in the inte ual parts of the bark. 
The external surface rough and more than wrinkled ; the epi- 
dermis tawny, slender, adhering very well to the bark, and filled 
with numerous transversal clefts ; internal surface ligneous; frac- 
ture very clear towards the exterior edges, but very ligneous in- 
ternally ; it breaks with difficulty,-and is with difficulty braised 
_ between the teeth. In its other characters it resembles the slen- 
der barks of Huanuco, but is less bitter and more nauseous. 
_ The species to which it belongs is still unknown. The Huanuco 
of commerce is mostly composed of this bark. 
with unknown barks and mixtures, which render distinction almost rnipaasible. Of all the 
mixtures, the least in consideration is that generally found under the name of Hfuenuco. It 
has sometimes portions of good species, the barks of the C. nitida and lanceolata, as M, Ruiz 
and others have remarked in the expedition of Santander in 1799; but most frequently the 
chests contain only barks in little repute, and almost the very refuse of commerce. 
