river from Maroro to Usenga and Usanga, and thence strike across
to Unyanyembe, sweeping clear of Ugogo.

With this determination, after despatching a third set of
specimens, consisting of large game animals, birds, snakes,
insects, land and freshwater shells, and a few rock specimens, of
which one was fossiliferous, we turned southwards, penetrating
the forests which lie between the greater range and the little
outlying one. At the foot of this is the Maji ya Wheta, a hot,
deep-seated spring of fresh water, which bubbles up through many
apertures in a large dome-shaped heap of soft lime--an
accumulation obviously thrown up by the force of the spring, as
the rocks on either side of it are of igneous character. We
arrived at the deserted village of Kirengue. This was not an easy
go-ahead march, for the halt had disaffected both men and mules.
Three of the former bolted, leaving their loads upon the ground;
and on the line of march, one of the mules, a full-conditioned
animal, gave up the ghost after an eighteen hours' sickness.
What his disease was I never could ascertain; but as all the
remaining animals died afterwards much in the same manner, I may
state for once and for all, that these attacks commenced with
general swelling, at first on the face, then down the neck, along
the belly and down the legs. It proved so obstinate that fire
had no effect upon it; and although we cut off the tails of some
to relieve them by bleeding, still they died.

In former days Kirengue was inhabited, and we reasonably hoped to
find some supplies for the jungly march before us. But we had
calculated without our host, for the slave-hunters had driven
every vestige of humanity away; and now, as we were delayed by