The peculiar shape of the city, built partly on the Pharos Island and peninsula, and partly on the mainland, is due, according to the chroniclers, to a patriotic whim of the founder, who planned the city in the form of a chlamys, the short cloak or tunic worn by the Macedonian soldiers. The modern city, though it has pushed its boundaries a good way to the east and west, still preserves this curious outline, though to a non-classical mind it rather suggests a star-fish. Various legends are extant to account for the choice of this particular spot for a Mediterranean port. According to the popular version, a venerable seer appeared to the Great Conqueror in a dream, and quoted those lines of the Odyssey which describe the one sheltered harbor on the northern coast of Egypt:--"a certain island called Pharos, that with the high-waved sea is washed, just against Egypt." Acting on this supernatural hint, Alexander decided to build his city on that part of the coast to which the Pharos isle acted as a natural breakwater, and where a small Greek fishing settlement was already established, called Rhacotis. The legend is interesting, but it seems scarcely necessary to fall back on a mythical story to account for the selection of this site. The two great aims of Alexander were the foundation of a center for trade, and the extension of commerce, and also the fusion of the Greek and Roman nations. For the carrying out of these objects, the establishment of a convenient sea-port with a commanding position at the mouth of the Nile was required. The choice of a site a little west of the Nile mouths was, no doubt, due to his knowledge of the fact that the sea current sets eastward, and that the alluvial soil brought down by the Nile would soon choke a harbor excavated east of the river, as had already happened at Pelusium. It is this alluvial wash which has rendered the harbors of Rosetta and Damietta almost useless for vessels of any draught, and at Port Said the accumulation of sand necessitates continuous dredging in order to keep clear the entrance of the Suez Canal.