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My own expeditions in various parts of Bornou, in Mandara, and Loggun, and the two fruitless attempts I made to complete the tour Of the great lake Tchad, will be found to occupy a considerable portion Of the volume; and being made in countries, and among a people unknown to Europeans,-many Of them even by name or report, — it is hoped that observations, faithfully and circumstantially minuted down at the time and spot, will not be found tedious or uninteresting to the reader.
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