Far south in the Atlantic there is an island that at first sight from the deck of a ship seems little more than a great rock. In shape it is oblong, with perpendicular sides several hundred feet high. It is called St. Helena because the Portuguese, who discovered it in 1502, came upon it on the birthday of St. Helena, Constantine's mother. To describe it as the geographies might, we may say that it lies in latitude 15 55' South, and in longitude 5 46' West. It is about ten and a half miles long, six and three-quarters miles broad, and its circumference is about twenty-eight miles. The nearest land is Ascension Island, about six hundred miles away, and St. Helena is eleven hundred miles from the Cape of Good Hope."