Five Weeks in a Balloon the need to release gas or throw ballast overboard to control his altitude, allows very long trips to be taken. This voyage is meant to link together the voyages of Sir Richard Burton and John Hanning Speke in East Africa with those of Heinrich Barth in the regions of the Sahara and Chad. The trip begins in Zanzibar on the east coast, and passes across Lake Victoria, Lake Chad, Agadez, Timbuktu, Djenné and Ségou to St Louis in modern-day Senegal on the west coast. The book describes the unknown interior of Africa near modern-day Central African Republic as a desert,
John Kirk (explorer) William Carnegie Kirk was author of "A British Garden Flora". The engineer, Alexander Carnegie Kirk, was John Kirk's elder brother. From 1858 to 1864 Kirk accompanied the explorer Dr David Livingstone on the Second Zambezi Expedition as a botanist and experienced his work to end the East African slave trade. He found Livingstone an inept leader and in 1862 wrote "I can come to no other conclusion than that Dr. Livingstone is out of his mind and a most unsafe leader"". In 1866 Livingstone’s began his next and final expedition, to find the source of the Nile, from Zanzibar. From