After several days' journey along the bank of the Atbara we halted at a spot called Collodabad, about one hundred and sixty miles from the Nile junction. A sharp bend of the river had left a deep pool about a mile in length, and here a number of Arabs were congregated, with their flocks and herds. On the evening of June 23d I was lying half asleep upon my bed by the margin of the river, when I fancied that I heard a rumbling like distant thunder. I had not heard such a sound for months, but a low, uninterrupted roll appeared to increase in volume, although far distant. Hardly had I raised my head to listen more attentively when a confusion of voices arose from the Arabs' camp, with a sound of many feet, and in a few minutes they rushed into my camp, shouting to my men in the darkness, "El Bahr! El Bahr!" (the river! the river!) We were up in an instant, and my interpreter, Mahomet, in a state of intense confusion, explained that the river was coming down, and that the supposed distant thunder was the roar of approaching water. Many of the people were asleep on the clean sand on the river's bed; these were quickly awakened by the Arabs, who rushed down the steep bank to save the skulls of two hippopotami that were exposed to dry. Hardly had they descended when the sound of the river in the darkness beneath told us that the water had arrived, and the men, dripping with wet, had just sufficient time to drag their heavy burdens up the bank. All was darkness and confusion, everybody talking and no one listening; but the great event had occurred; the river had arrived "like a thief in the night". On the morning of the 24th of June, I stood on the banks of the noble Atbara River at the break of day. The wonder of the desert! Yesterday there was a barren sheet of glaring sand, with a fringe of withered bushes and trees upon its borders, that cut the yellow expanse of desert. For days we had journeyed along the exhausted bed; all Nature, even in Nature's poverty, was most poor: no bush could boast a leaf, no tree could throw a shade, crisp gums crackled upon the stems of the mimosas, the sap dried upon the burst bark, sprung with the withering heat of the simoom. In one night there was a mysterious change. Wonders of the mighty Nile! An army of water was hastening to the wasted river. There was no drop of rain, no thunder-cloud on the horizon to give hope. All had been dry and sultry, dust and desolation yesterday; to-day a magnificent stream, some five hundred yards in width and from fifteen to twenty feet in depth, flowed through the dreary desert! Bamboos and reeds, with trash of all kinds, were hurried along the muddy waters. Where were all the crowded inhabitants of the pool? The prison doors were broken, the prisoners were released, and rejoiced in the mighty stream of the Atbara.