Traveller, born at Lausanne, sent out from England by the African Association to explore Africa; travelled by way of Syria; acquired a proficiency in Arabic, and assumed Arabic customs; pushed on to Mecca as a Mussulman pilgrim—the first Christian to risk such a venture; returned to Egypt, and died at Cairo just as he was preparing for his African exploration; his travels were published after his death, and are distinguished for the veracious reports of things they contain (1784-1817).