The agricultural and forest products of British West AfricaDudgeon, Gerald C. (Gerald Cecil)
History
The agricultural and forest products of British West Africa
Dudgeon, Gerald C. (Gerald Cecil)
Agriculture -- Africa, West; Forest products -- Africa, West
The wild trees grow from 50 to 100 feet in height, and often
have a girth of three feet at four feet from the base; the trunk
being commonly without branches for a considerable height. The
native ascends the trunk by means of a sling passed round it,
to one end of which is a loop which fits over his right thigh
and to the other a stirrup in which he keeps his left foot. By
moving the rope up the tree the ascent is quickly accomplished,
and when stationary, both hands are left free. The climber carries
a gouge, or semi-cylindrically-faced chisel, with which he cuts
vertical as well as transverse oblique grooves, forming a rough
“herring-bone” pattern, which may be continued for the whole
length of the trunk, and even extend on to the main branches. To
make the cuts the tool is either used in one hand or is held in
the left and driven by blows on the end of the handle, given with
the palm of the right hand. The flow of latex commences at once,
and is directed down the vertical channel into a calabash placed
at the base of the tree, into which the latex is guided by a lip of
clay or a chip of wood. The illustration shows a native in Ashanti
tapping a tree (Fig. 18). The quantity of latex procured at the
one tapping varies; an exceptionally large amount being about two
quarts from a large tree. The tree is not tapped again for several
months and until the wounds have healed. On the second tapping
the same form of cuts is made upon the opposite side of the tree,
and the transverse channels often intersect those made previously;
besides this, owing to the want of regulation in the depth of the
cuts, the inner or cambium layer of the bark may be so damaged that
the intersecting cuts may ring the tree and cause death. Few trees
probably survive the third or fourth tapping.
[Illustration: “ODUM” TREES _CHLOROPHORA EXCELSA_.
Fig. 19, p. 72.]
[Illustration: PARA RUBBER TREE (_HEVEA BRASILIENSIS_), TAPPED
AT ABURI.
Fig. 20, p. 66.]
[Illustration: RUBBER TREE TAPPED, HERRING-BONE SYSTEM IMPERFECT,
ABURI.
Fig. 21, p. 61.]
If the herring-bone cuts were made carefully upon the lower part of
the trunk, and attention given to their depth and direction, the tree
might be preserved for a longer period. An illustration given shows
the incorrect mode of tapping, where the transverse cuts are opposite
instead of alternate (Fig. 21). Experiments seem to show that there
is not the same “wound response” in the case of Funtumia trees
as is found in that of the “Para” tree (_Hevea brasiliensis_);
the paring of the wounds some days after tapping yielding no flow
of latex similar to that procured in the first instance. On cutting
the bark area between the transverse channels, the latex cells
appeared to be empty and to indicate that a large area is drained
on the first tapping. Further investigation is necessary in order
to compare the results obtained from this tree with those of _Hevea_.
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