The Forests of British Guiana. 191 
WASHIBA OR Bow-WOOD grows to a large size, but 
it is a rare tree and little known. Its wood, of an olive 
colour, is exceedingly tough, hard and close-grained, and 
is the best known wood for-bows. Its average height is 
about 120 feet, and it can be had to square 30 inches, 
free of sap. 
Tibicusi or Bastard Letter Wood is a rare 
wood, and only used for bows, walking sticks and 
inlaying cabinet work. The heart is beautifully mar- 
ked, hard, heavy, and close-grained. The sap 
decays rapidly if exposed to the weather. The average 
height is about 60 feet, and it will square 5 inches. 
Buro-Koro, Paira or Letter-Wood, (Brosimum 
Aubletii, Piratinera Guianensis Audi.) is a rare tree 
near the coast, but plentiful in the interior. Its wood 
is used for the same purposes as tibicusi. It is beauti- 
fully marked, close-grained, takes a high degree of polish, 
and is very heavy. Letter-wood trees are sometimes of 
great size, but the heart, which is the only useful part, 
is very small, — a tree of 29 inches in diameter having 
only 7 inches of heart ; the average height is about 60 
feet. 
KERITEE is a species of siruaballi, and is plentiful 
in some localities. The wood has a strong aromatic 
scent, is light, and in colour and appearance, resembles 
satin-wood ; it is useful for partitions and the upper 
planking of boats. Its average height is about 80 
feet, and it will square 20 inches. 
KOOROOBOORELLI or PuRPLE-HEART {Copaifera 
ubiflora, and bracteata, Benth.) is of two kinds, called 
koorooboorelli and marawinaroo. The bark of the 
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