The Nile was full of hippopotami and crocodiles, both of them dangerous enough, and the latter particularly so. To attempt to swim the horses over would have been certain death to them, as the crocodiles would have welcomed the animals as rare material for a feast. There was no raft provided for carrying them, and the only boats were 'dug-outs,' hollowed from the trunks of trees. They were simply canoes, not over three or at most four feet in width, and they shook from end to end when a man stepped into them. But unless the horses could be taken into them, there was no chance of crossing. [Illustration: NAVIGATION UNDER DIFFICULTIES.] Captain Mohammed ordered one of the boats to be brought close to the bank and held there as firmly as possible. Then weeds and grass were piled so as to conceal any interval between boat and shore; the captain's horse was blindfolded with a handkerchief, and, all trembling with fear, was led into the frail canoe. A man stood by his head to prevent his jumping overboard with fright, the boatman pushed away, and a soldier stood in the bow of the boat, shooting at the river-horses, to keep them at a respectful distance. Another boat received Frank's horse, and one after another the steeds were taken over the Victoria Nile in safety. One of them struggled a little during the transit, and came near upsetting the boat, to the imminent peril of all concerned. The poor beast was soon quieted, and seemed to understand that his safety lay in his docility. As for the others, they hardly moved a muscle, except in the involuntary trembling caused by fear. Abdul said that this part of the river was one of the most dangerous, as it was only at the peril of a man's life that he could venture near the water. Hardly a day passed that some unfortunate native was not eaten by the crocodiles, having paid with his life the penalty of carelessness. Since the post was established at Foueira the crocodiles and hippopotami have been cleared out to some extent, but the places of those that are killed are generally taken without much delay. [Illustration: AN UNPLEASANT ACQUAINTANCE.] The day of his arrival Frank was strolling by the river not far from the camp, when he came suddenly upon a "hippo" engaged at his breakfast. The creature was munching away at the grass as though entirely at home; when he saw the intruder he gave a loud grunt, followed by a roar, and he paused in his eating, as if uncertain what to do.