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Chapter 40 Dr. Ferguson's Anxieties.—Persistent Movement south-ward.—A Cloud of Grasshoppers.—A View of Jenne.—A View of Sego.—Change of the Wind.—Joe's Regrets. The flow of the river was, at that point, divided by large is-lands into narrow branches, with a very rapid current. Upon one among them stood some shepherds' huts, but it had be-come impossible to take an exact observation of them, because the speed of the balloon was constantly increasing. Unfortunately, it turned still more toward the south, and in a few moments crossed Lake Debo. Dr. Ferguson, forcing the dilation of his aerial craft to the utmost, sought for