But before turning to their geographical discoveries we must see how Cosmas, the Egyptian merchant-monk, set the clock back by his quaint theories of the world in the sixth century. Cosmas hailed from "Alexander's great city." His calling carried him into seas and countries remote from home. He knew the Mediterranean Sea, the Persian Gulf, and the Red Sea. He had narrowly escaped shipwreck in the Indian Ocean, which in those days was regarded with terror on account of its violent currents and dense fogs. As the ship carrying the merchant approached this dread region, a storm gathered overhead, and flocks of albatross, like birds of ill-omen, hovered about the masts. "We were all in alarm," relates Cosmas, "for all the men of experience on board, whether passengers or sailors, began to say that we were near the ocean and called out to the pilot: 'Steer the ship to port and make for the gulf, or we shall be swept along by the currents and carried into the ocean and lost.' For the ocean rushing into the gulf was swelling with billows of portentous size, while the currents from the gulf were driving the ship into the ocean, and the outlook was altogether so dismal that we were kept in a state of great alarm." That he eventually reached India is clear, for he relates strange things concerning Ceylon. "There is a large oceanic island lying in the Indian Sea," he tells us. "It has a length of nine hundred miles and it is of the like extent in breadth. There are two kings in the island, and they are at feud the one with the other. The island, being as it is in a central position, is much frequented by ships from all parts of India, and from Persia and Ethiopia, and from the remotest countries, it receives silk, aloes, cloves, and other products ... farther away is the clove country, then Tzinista (China), which produces silk. Beyond this there is no other country, for the ocean surrounds it on the east." Cosmas was the first to realise that China was bounded on the east by the ocean. He tells us a good story about the "Lord of India," who always went to war with two thousand elephants. "Once upon a time this king would lay siege to an island city of the Indians, which was on every side protected by water. A long while he sat down before it, until, what with his elephants, his horses, and his soldiers, all the water had been drunk up. He then crossed over to the city dryshod and took it." [Illustration: THE MOUNTAIN OF COSMAS, CAUSING NIGHT AND DAY AND THE SEASONS.] But, strange as are the travels and information of Cosmas, still stranger is his _Christian Topography_. His commercial travelling done he retired, became a devout Christian monk, and devoted his leisure time in trying to reconcile all the progress of geographical knowledge with old Biblical ideas.