cucumber, grapes and tobacco for their own account, in addition to the dates, whose surplus was sent across to the Sudan by sailing dhow, and there exchanged for corn, clothing and the luxuries of Africa or Europe.
After the midday heat was passed we mounted again, and rode up the clear, slow rivulet till it was hidden within the palm-gardens, behind their low boundary walls of sun-dried clay. In and out between the tree roots were dug little canals a foot or two deep, so contrived that the stream might be let into them from the stone channel and each tree watered in its turn. The head of water was owned by the community, and shared out among the landowners for so many minutes or hours daily or weekly according to the traditional use. The water was a little brackish, as was needful for the best palms; but it was sweet enough in the wells of private water in the groves. These wells were very frequent, and found water three or four feet below the surface.
Our way took us through the central village and its market street. There was little in the shops; and all the place felt decayed. A generation ago Wasta was populous (they said of a thousand houses); but one day there rolled a huge wall of water down Wadi Safra, the embankments of many palm-gardens were breached, and the palm trees swept away. Some of the islands on which houses had stood for centuries were submerged, and the mud houses melted back again into mud, killing or drowning the unfortunate slaves within. The men could have been replaced, and the trees, had the soil remained; but the gardens had been built up of earth carefully won from the normal freshets by years of labour, and this wave of water—eight feet deep, running in a race for three days—reduced the plots in its track to their primordial banks of stones.
A little above Wasta we came to Kharma, a tiny settlement with rich palm-groves, where a tributary ran in from the north. Beyond Kharma the valley widened somewhat, to an average of perhaps four hundred