The Atbara, although so important a river in the rainy season of Abyssinia, is perfectly dry for several months during the year, and at the time I first saw it, June 13, 1861, it was a mere sheet of glaring sand; in fact a portion of the desert through which it flowed. For upwards of one hundred and fifty miles from its junction with the Nile, it is perfectly dry from the beginning of March to June. At intervals of a few miles there are pools or ponds of water left in the deep holes below the general average of the river's bed. In these pools, some of which may be a mile in length, are congregated all the inhabitants of the river, who as the stream disappears are forced to close quarters in these narrow asylums; thus, crocodiles, hippopotami, fish, and large turtle are crowded in extraordinary numbers, until the commencement of the rains in Abyssinia once more sets them at liberty by sending down a fresh volume to the river. The rainy season commences in Abyssinia in the middle of May, but the country being parched by the summer heat, the first rains are absorbed by the soil, and the torrents do not fill until the middle of June. From June to the middle of September the storms are terrific; every ravine becomes a raging torrent; trees are rooted up by the mountain streams swollen above their banks, and the Atbara becomes a vast river, bringing down with an overwhelming current the total drainage of four large rivers--the Settite, Royan, Salaam, and Angrab--in addition to its own original volume. Its waters are dense with soil washed from most fertile lands far from its point of junction with the Nile; masses of bamboo and driftwood, together with large trees, and frequently the dead bodies of elephants and buffaloes, are hurled along its muddy waters in wild confusion, bringing a rich harvest to the Arabs on its banks, who are ever on the look-out for the river's treasures of fuel and timber. The Blue Nile and the Atbara receiving the entire drainage of Abyssinia, at the same time pour their floods into the main Nile in the middle of June. At that season the White Nile is at a considerable level, although not at its HIGHEST; and the sudden rush of water descending from Abyssinia into the main channel, already at a fair level from the White Nile, causes the annual inundation in Lower Egypt.