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Hen the author of this book was composing his recent work on the Uganda Protectorate, he was led through the history of its discovery into the general consideration of Nile exploration, since it was in the search for the Nile sources that the terri tories now forming the Uganda Protectorate were laid bare to the gaze of the civilised world. But as, anything like a detailed review of the exploration of the Nile basin by the Caucasian race would have un duly extended a book dealing more particularly with Uganda, he gladly took advantage of the suggestion made by Dr. Scott Keltie (editor of this series) that these studies should be applied to the present volume, which is one of a series on the history of great geo graphical discoveries.
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