We find him again setting forth on the 29th of March,
1851, with Overweg, to visit the kingdom of Adamaoua,
to the south of the lake, and from there he pushed on as
far as the town of Yola, a little below nine degrees north
latitude. This was the extreme southern limit reached by
that daring traveller.
He returned in the month of August to Kouka; from
there he successively traversed the Mandara, Barghimi,
and Klanem countries, and reached his extreme limit in
the east, the town of Masena, situated at seventeen
degrees twenty minutes west longitude.
On the 25th of November, 1852, after the death of
Overweg, his last companion, he plunged into the west,
visited Sockoto, crossed the Niger, and finally reached
Timbuctoo, where he had to languish, during eight long
months, under vexations inflicted upon him by the sheik,
and all kinds of ill-treatment and wretchedness. But the
presence of a Christian in the city could not long be
tolerated, and the Foullans threatened to besiege it. The
doctor, therefore, left it on the 17th of March, 1854, and
fled to the frontier, where he remained for thirty-three
days in the most abject destitution. He then managed to
get back to Kano in November, thence to Kouka, where
he resumed Denham's route after four months' delay.
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