They travelled along the banks of the river for some days, stopping by the side of the pools which still remained. Many of these pools were full of crocodiles and hippopotami. One of these river-horses had lately killed the proprietor of a melon-garden, who had attempted to drive the creature from his plantation. Mr Baker had the satisfaction of killing one of the monsters in shallow water. It was quickly surrounded by Arabs, who hauled it on shore, and, on receiving his permission to take the meat, in an instant a hundred knives were at work, the men fighting to obtain the most delicate morsels. He and his wife breakfasted that morning on hippopotamus flesh, which was destined to be their general food during their journey among the Abyssinian tributaries of the Nile. Game abounded, and he shot gazelles and hippopotami sufficient to keep the whole camp well supplied with meat. On the 23rd of June they were nearly suffocated by a whirlwind that buried everything in the tents several inches in dust. The heat was intense; the night, however, was cool and pleasant. About half-past eight, as Mr Baker lay asleep, he fancied that he heard a rumbling like distant thunder. The low uninterrupted roll increasing in volume, presently a confusion of voices arose from the Arabs' camp, his men shouting as they rushed through the darkness: "The river! the river!" Mahomet exclaimed that the river was coming down, and that the supposed distant roar was the approach of water. Many of the people, who had been sleeping on the clean sand of the river's bed, were quickly awakened by the Arabs, who rushed down the steep bank to save the skulls of two hippopotami which were exposed to dry. The sound of the torrent, as it rushed by amid the darkness, and the men, dripping with wet, dragging their heavy burdens up the bank, told that the great event had occurred. The river had arrived like a thief in the night. The next morning, instead of the barren sheet of clear white sand with a fringe of withered bush and trees upon its borders, cutting the yellow expanse of desert, a magnificent stream, the noble Atbara river flowed by, some five hundred yards in width, and from fifteen to twenty feet in depth. Not a drop of rain, however, had fallen; but the current gave the traveller a clue to one portion of the Nile mystery. The rains were pouring down in Abyssinia--these were the sources of the Nile. The rainy season, however, at length began, during which it was impossible to travel. The Arabs during that period migrate to the drier regions in the north.