We have seen that the western bank of the Suez Canal was already provided with a plentiful supply of fresh water by the Sweet Water Canal. Plant was now installed for making this water available for the troops. Purity had to be considered as well as adequacy of supply. A peculiar danger had to be guarded against. There is a disease prevalent in Egypt, of a particularly unpleasant character and persistent type, called by the medical profession Bilhaziosis, but better known to our men as "Bill Harris." This disease is conveyed by a parasitic worm found in the waters of the Nile, and affects not only those who drink the water, but also those who bathe in it or merely wash. Consequently, orders were stringent against even touching Nile water which had not previously been treated. This necessitated the troops east of the Canal being put upon a very restricted supply, and they were accordingly rationed at the rate of a gallon of water per head per day for all purposes, including washing, cooking and drinking. At the Kantara waterworks water was drawn in from the Sweet Water Canal, mixed with alum, and pumped through settling tanks into filters. When it had passed through these, it was pumped underneath the Suez Canal into reservoirs on the eastern bank. Here it was chlorinated; and hence the water, now fit for all purposes, was pumped forward to its destination. There being no gradient to assist the natural flow of the water, it had to be pumped forward by successive stages. The first stage was as far as Romani; when working at greatest length the pumping stages numbered no less than seventeen. At times, during the advance, the railway had to be called in aid; and train-loads of water for the use of advanced troops were railed from pipe-head up to rail-head. At some stages of the advance this supply could be supplemented by local water, which, though generally somewhat brackish, was employed for the horses, mules and camels. It was even found to have no ill-effect upon the troops, if used for a limited period, and if necessary precautions were taken. At other stages, where water was non-existent, or rendered wholly unapproachable by enemy dispositions, our force became entirely dependent upon the supply delivered through the pipe-line. Ultimately, when we settled down to protracted trench warfare before Gaza, this pipe-line was delivering a constant supply of water into our trenches, distant some couple of hundred miles from the banks of the Nile. Kantara started upon a process of development worthy of the base of such an expedition. Before the war, it had been little more than a small Canal village, comprising a few huts. It eventually grew into an important railway terminus with wharves and cranes, a railway ferry and 40 miles of sidings. Miles of first-class macadamized roads were made, vast ordnance and supply dumps arose, and camps and depots were established for man and beast. The scale on which this mushroom town developed was stupendous.