For though tract after tract may be desert, presenting nothing but coarse growth and sand ready to drift before the wind, there is not much difficulty in finding water, notably in the wide plateau known as Mariout, spreading out in the direction of the Libyan Desert from Alexandria. Here the sinking of wells results in the finding of water at depths varying from twenty to forty feet, and boring to a greater depth would doubtless produce a fuller supply, for in so flat and porous a land, within easy measurable distance of the great inland sea, there is every probability that an inexhaustible supply is within touch. And nowadays the various ingenious contrivances of the mechanical engineer are always ready, and at small cost, to supplement during the dry times the abundant supply offered by the great river. Of course, this deals solely with the higher grounds that are not reached without mechanical help by the dam-supplied network of canals that already veins the country, and projects for the increase of which are, since the opening of the great works at Assiout and Assouan, either under consideration, or already planned. The slow, clumsy hand labour of the shadoof and the awkward cattle-worked sakieh, or earthen pot surrounded water-wheel, is now being superseded in the larger tracts of cultivation by such ingenious pieces of mechanism as the centrifugal pump, worked by steam, and so contrived that it can be utilised on the bank of river or canal, and with a suction tube turned down at any angle, so that it can be lowered into any of the common wells that are sunk in all directions. The portable steam engine used in connection therewith is one of the grandest slaves of civilisation, playing its part on the large farms for traction, threshing, straw chopping, or other of the many necessities of cultivation. By means of these centrifugal pumps after the middle of November on large estates the water has to be forced into the service (estate) canals. A ten-horse power engine, driving a ten-inch pump, will irrigate the same number of acres in twelve hours, lifting the water five feet, the cost of raising water being two shillings per acre. The small occupiers of land sometimes raise their supply from wells and canals by means of Persian wheels or Archimedean screws. CHAPTER FOUR. At Cairo when the Nile commences its annual rise, for the first few days its tint seems to be green; but the general tone during the inundation is of a dirty red, of course due to its being thickened with the mud brought down from the south. During this rising, irrigation can be sent freely flowing over all cultivated lands, as the river continues about the level of the banks till the middle of November.