The course of the
Blue Nile is through fertile soil; thus there is a trifling loss by
absorption, and during the heavy rains a vast amount of earthy matter of
a red colour is contributed by its waters to the general fertilizing
deposit of the Nile in Lower Egypt.
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.
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