Alexander, who flourished 324 years before Christ, travelled from Europe into Asia and Africa, passed through Armenia, Assyria, Persia, and Bactria; whence he descended by the mountains of Imaus and the vallies of Parapomissus, into India, and prepared a navy on the river Indus, with which he passed into the ocean. He there turned by the lands of Gedrosia, Caramania, and Persia, to the great city of Babylon, leaving the command of his fleet to Onesicratus and Nearchus, who sailed through the straits of the Persian Sea and up the river Euphrates, discovering the whole coast between the Indus and that river. After the death of Alexander, Ptolemy became king of Egypt, who by some was reputed to have been the bastard son of Philip, the father of Alexander: He, imitating the before named kings, Sesostris and Darius, caused dig a canal from the branch of the Nile which passed by Pelusium, now by the city of Damieta[34]. This canal of Ptolemy was an hundred feet broad and thirty feet deep, and extended ten or twelve leagues in length, till it came to the _bitter wells_. He meant to have continued it to the Red Sea; but desisted on the idea that the Red Sea was three cubits higher than the land of Egypt, and would have overflowed all the country, to its entire ruin. Ptolemy Philadelphus, in the year 277 before Christ, changed the direction of the Indian traffic. The goods from Europe, by his orders, were carried up the Nile from Alexandria to the city of Coptus, and conveyed across the desert from thence to the sea-port of Myos-Hormos on the Red-sea[35]. To avoid the excessive heat, the caravans travelled only in the night, directing their course by the stars; and water being very scarce in the desert, they had to carry a sufficient quantity with them for the journey. Afterwards, to avoid this trouble, deep wells were dug at certain intervals; and in other places large cisterns or reservoirs were constructed for the reception of rain water. Still later, in consideration of the dangers attending the port of Myos-Hormos, on account of flats and islands, Philadelphus sent an army into Troglodytica, where he constructed a haven called Berenice, in which the ships engaged in the Indian commerce took shelter, as a place of greater security. From thence the goods were transported to the city of Coptus, and afterwards to Alexandria, which became rich and famous, through its trade with India, beyond any other city in the world; insomuch that it is asserted that the customs of Alexandria yielded every year to Ptolemy Auletes, the father of Cleopatra, seven millions and a half of gold, though the traffic had then scarcely subsisted in that direction for twenty years[36]. After the reduction of Egypt and Alexandria under the power of the Romans, the customs are said to have advanced to double that amount; and the trade was so great, that 120 ships used to be sent yearly from Myos-Hormos to India.