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I. An Account of the Peruvian or Jefuits 
Bark, by Mr. John Gray, F. R. S. now at 
Cartagena in the Spanifh Weft-Indies j 
extracted from fame Fapers given him by 
Mr. William Arrot, a Scotch Surgeon , 
who had gather'd it at the Flare where 
it grows in Peru. Communicated by Phil. 
Miller, F. R S. See. 
T HE Tree from which the Jefuits Bark is cut, 
grows in the Kingdom of Peru, in the Spanijh 
JVefi -Indies, and is found moft commonly in 
the Provinces of Loxa, Ayavaca and Quenca, which 
are fituated between two and five Degrees of South Lati- 
tude. This Tree is tall, and has a Trunk rather bigger 
than a Man’s Thigh, tapering from the Root upwards, 
has no Boughs or Branches till near its Top, which 
grow as regular as if lopp’d artificially, and with the 
Leaves form exactly the Figure of a Hemifphere : Its 
Bark is of a blackilh Colour on the Outfide, and fome- 
times mixt with white Spots, whence commonly 
grows a kind of Mofs, called by the Spaniards, Bar- 
bas ; its Leaves referable much the Leaves of our 
Plum-tree, of a darkifh green Colour on their upper 
or concave Side, and on their lower or convex Side, 
reddifh : Its Wood is as hard as our common Englijb 
Ajb , and rather tough than brittle. 
There are four forts of the Bark of this Tree, to 
which the Spaniards give the following Names, viz. 
CaJ'carilla color ada, or reddifh Bark ; amarylla, yel- 
lowifh 5 crefpilla, curlings and blanca, whitilh: But 
L ~ Mr. 
