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and was not of a carbonaceous nature, since the greater part of it 
dissolved in alcohol, my suspicion was realized by means of am- 
moniac and the solution of zinc, which précipitated it in foliacéous 
flakes-of a dark colour. | . 
Diagnostic characters which good and well selected Bark of 
; . Yallhoy ought to possess. 
It is to be remembered, that the barks of the root of the 
Yallhoy are to be entirely-separated from the ligneous part in 
sticks or little tubes, from a sixth to half a yard in length, and 
they are to possess the following characteristics, when well col- 
lected and preserved. 
Thickness of the tubes—from half an inch to two inches in 
circumference, and the edges rolled inwards one over another, 
and sometimes each by itself, forming in this case a double or 
fluted cane. a | : 
Surface—longitudinally furrowed, by a few fissures, caused 
by the separation of the little roots which were in those parts. _ : 
Exterior colour—betwe en a straw and bay colour, and mostly — 
with clear greyish spots. ‘,04 ice nasnueké, aoe ae 
Interior colour—dark tawny. The liber of a pale white. The 
powder, of a whitish yellow colour. | 
The liber—trom half a line to a line nithickness. 
Consistence—compact, like a thin cake of common glue. , 
Fracture or cutting—of considerable resistance, and equal, 
without being torn or fibrous at the edges. 
