constructing numerous embankments, to prevent the irruption of the water, which, if these mounds were broken down by the neglect of their keepers, would rather inundate and destroy than irrigate the lands below. The Egyptians who inhabit the plains, as Arculf, who frequently passed backward and forward along the Nile, observed, make their houses over canals by laying planks across. Arculf relates further, that the river Nile is haunted by crocodiles, aquatic beasts, not so large as they are ravenous, and so strong, that if one of them see by chance a horse or an ass, or even an ox, feeding near the bank of the river, he suddenly rushes out to attack it, and seizing it perhaps by the foot, drags it under the water, and devours the whole. On his return from Alexandria, Arculf went to Constantinople, which is bounded on all sides, except the north, by the sea. The circuit of the walls, which are angular, according to the line of the sea, is about twelve miles. Constantine was at first disposed to build it in Cilicia, near the sea which separates Europe and Asia; but on a certain night all the iron tools were carried away, and when men were sent to seek them, they were found on the European side; for there it was God's will that the city should be built. In this city is a church of wonderful workmanship, called the Church of St. Sophia, built circular from its foundation, domed in, and surrounded by three walls. It is supported to a great height on columns and arches, and has, in its inmost part, on the north side, a large and beautiful closet, wherein is a wooden chest with a wooden lid, containing three pieces of our Lord's cross[21]; that is to say, the long timber cut in two, and the transverse part of the same holy cross. These pieces are exhibited for the adoration of the people three times only in the year; namely, on the day of our Lord's Supper, the day of the Preparation, and on Holy Saturday. On the first of these, the chest, which is two cubits long and one broad, is set out on a golden altar, with the holy cross exposed to view: the Emperor first approaches, and, after him, all the different ranks of laymen in order kiss and worship it; on the following day, the Empress and all the married women and virgins do the same; on the third day, the bishops and different orders of the clergy observe the same ceremonies; and then the chest is shut, and carried back to the closet before mentioned.