Soap-boiling is not so easy as may be imagined; it requires not
only much attention, but the quality is dependent upon the proper
mixture of the alkalis. Sixty parts of potash and forty of lime
are, I believe, the proportions for common soap. I had neither
lime nor potash, but I shortly procured both. The hegleek tree
(Balanites Egyptiaca) was extremely rich in potash; therefore I
burned a large quantity, and made a strong ley with the ashes;
this I concentrated by boiling. There was no limestone; but the
river produced a plentiful supply of large oyster-shells, that,
if burned, would yield excellent lime. Accordingly I constructed
a kiln, with the assistance of the white ants. The country was
infested with these creatures, which had erected their dwellings
in all directions; these were cones from six to ten feet high,
formed of clay so thoroughly cemented by a glutinous preparation
of the insects, that it was harder than sun-baked brick. I
selected an egg-shaped hill, and cut off the top, exactly as we
take off the slice from an egg. My Tokrooris then worked hard,
and with a hoe and their lances, they hollowed it out to the
base, in spite of the attacks of the ants, which punished the
legs of the intruders considerably.
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