John Hanning Speke of the way. Once Speke and Burton were back on the coast they went by ship to Zanzibar and then traveled to Aden. When back at the coast Burton had written a letter to Norton Shaw of the Royal Geographical Society (which had partially sponsored the journey) in which Burton enclosed a map of Lake Victoria made by Speke and wrote "there are grave reasons for believing it (the map) to be the source of the principal feeder of the White Nile." Once in Aden, Burton was not granted a medical certificate to travel and thus Speke left on HMS
John Hanning Speke an appendix in his own book on his travels to Harrar. It seemed unlikely that the two would join again and Burton believed that he would not lead an expedition to the interior of Africa, his fervent hope, after this failed journey. In 1856, Speke and Burton went to East Africa to find the Great Lakes, which were rumored to exist in the center of the continent. It was hoped that the expedition would locate the source of the Nile. The journey, which started from Zanzibar Island in June 1857, was extremely strenuous and both men fell ill from a