can face the long grass and superabundant water in the way to Manyuema.

[Illustration: Lines of Green Scum]

The green scum which forms on still water in this country is of
vegetable origin--confervæ. When the rains fall they swell the lagoons,
and the scum is swept into the Lake; here it is borne along by the
current from south to north, and arranged in long lines, which bend from
side to side as the water flows, but always N.N.W. or N.N.E., and not
driven, as here, by the winds, as plants floating above the level of the
water would be.

_7th June, 1869._--It is remarkable that all the Ujiji Arabs who have
any opinion on the subject, believe that all the water in the north, and
all the water in the south, too, flows into Tanganyika, but where it
then goes they have no conjecture. They assert, as a matter of fact,
that Tanganyika, Usigé water, and Loanda, are one and the same piece of
river.

Thani, on being applied to for men and a canoe to take me down this line
of drainage, consented, but let me know that his people would go no
further than Uvira, and then return. He subsequently said Usigé, but I
wished to know what I was to do when left at the very point where I
should be most in need. He replied, in his silly way, "My people are
afraid; they won't go further; get country people," &c. Moenegheré sent
men to Loanda to force a passage through, but his people were repulsed
and twenty killed.

Three men came yesterday from Mokamba, the greatest chief in Usigé,
with four tusks as a present to his friend Moenegheré, and asking for