"You will see representations of the shadoof on the walls of the temples and tombs of Egypt, and the conclusion is certain that the form has not changed in the least in three thousand years. When the Nile is at its height there is no need of anything of the sort, as the water flows all over the land, and the entire country is inundated. As soon as the river falls it is necessary to raise water by artificial means, as the growing plants in the fields would soon perish under the hot sun of Egypt without a supply of moisture. Then the shadoof comes in play, and the more the river descends the greater is the number demanded. In some parts of the country the _sakkieh_ is used in place of the shadoof, and the result is the same." Fred wished to know the difference between the shadoof and the sakkieh. [Illustration: A SAKKIEH, OR WATER-WHEEL.] "The sakkieh," said the Doctor, "is a wheel operated by a beast of burden--a horse, camel, mule, donkey, or ox. The animal walks in a circle, and turns a horizontal wheel which has cogs connected with an upright wheel, bearing a circle of earthen buckets on its rim. These buckets dip in water as the wheel turns; their mouths are then brought uppermost, and they raise the water and pour it into a trough. Where the water must be raised to a great height from a well, or from the side of a perpendicular bank, two wheels are used, one at the spot where the animal walks, and the other at the surface of the water. A stout band or rope passes over the wheels, and to this band buckets are attached to lift the water. I have seen water raised fifty or sixty feet by this process, the ox or mule walking patiently for hours, until it was his turn to be relieved." While the Doctor was talking the train passed a sakkieh, which was being turned by a pair of oxen driven by a small boy. The boys observed that the eyes of the animals were blindfolded by means of a piece of cloth drawn over their heads, and they naturally wished to know the reason of it. "It is the custom of the country," was the reply. "The animals are believed to work better when their attention is not drawn to things around them, and they are less likely to be frightened if anything unusual happens in their neighborhood. This is particularly the case with the native buffalo and with the mule, and the practice of blindfolding the latter animal is not unknown in our own country. On the Western plains and among the Rocky Mountains it is the custom to throw a blanket over the head of a pack-mule when he is being saddled and is about to receive his burden. He stands perfectly quiet during the whole operation; while, if he were not temporarily deprived of sight, he would be very restive, and perhaps would break away from his driver, and scatter things around him very miscellaneously." [Illustration: A PLOUGHMAN AT WORK.]