"On foot or on mules."

"Exactly the same, so far as I am concerned," ejaculated Kennedy.

"Lastly," resumed the doctor, "M. de Heuglin, the
Austrian vice-consul at Karthoum, has just organized a
very important expedition, the first aim of which is to
search for the traveller Vogel, who, in 1853, was sent into
the Soudan to associate himself with the labors of Dr.
Barth. In 1856, he quitted Bornou, and determined to
explore the unknown country that lies between Lake Tchad
and Darfur. Nothing has been seen of him since that
time. Letters that were received in Alexandria, in 1860,
said that he was killed at the order of the King of Wadai;
but other letters, addressed by Dr. Hartmann to the traveller's
father, relate that, according to the recital of a felatah
of Bornou, Vogel was merely held as a prisoner at
Wara. All hope is not then lost. Hence, a committee
has been organized under the presidency of the Regent of
Saxe-Cogurg-Gotha; my friend Petermann is its secretary;
a national subscription has provided for the expense
of the expedition, whose strength has been increased
by the voluntary accession of several learned men, and
M. de Heuglin set out from Massowah, in the month of
June. While engaged in looking for Vogel, he is also to
explore all the country between the Nile and Lake Tchad,
that is to say, to knit together the operations of Captain
Speke and those of Dr. Barth, and then Africa will have
been traversed from east to west."*