Here was new land outside the boundaries of the Empire--country great with possibilities. Pliny, writer of the _Natural History_, now arises and endeavours to clear the minds of his countrymen by some account of these northern regions. Strabo had been dead some fifty years, and the Empire had grown since his days. But Pliny has news of land beyond the Elbe. He can tell us of Scandinavia, "an island of unknown extent," of Norway, another island, "the inhabitants of which sailed as far as Thule," of the Seamen or Swedes who lived in the "northern half of the world." "It is madness to harass the mind with attempts to measure the world," he asserts, but he proceeds to tell us the size of the world as accepted by him. "Our part of the earth, floating as it were in the ocean, which surrounds it, stretching out to the greatest extent from India to the Pillars at Cadiz, is eight thousand five hundred and sixty-eight miles ... the breadth from south to north is commonly supposed to be half its length." But how little was known of the north of Europe at this time is shown by a startling statement that "certain Indians sailing from India for the purposes of commerce had been driven by tempests into Germany." "Thus it appears," concludes Pliny, "that the seas flow completely round the globe and divide it into two parts." How Balbus discovered and claimed for the Empire some of the African desert is related by Pliny. He tells us, too, how another Roman general left the west coast of Africa, marched for ten days, reached Mt. Atlas, and "in a desert of dark-coloured sand met a river which he supposed to be the Niger." The home of the Ethiopians in Africa likewise interested Pliny. "There can be no doubt that the Ethiopians are scorched by their vicinity to the sun's heat, and that they are born like persons who have been burned, with beard and hair frizzled, while in the opposite and frozen parts of the earth there are nations with white skins and long light hair." Pliny's geography was the basis of much mediaeval writing, and his knowledge of the course of the Niger remained unchallenged, till Mungo Park re-discovered it many centuries after. [Illustration: A ROMAN GALLEY, ABOUT 110 A.D. From Trajan's Column at Rome.] CHAPTER X PTOLEMY'S MAPS And so we reach the days of Ptolemy--the last geographer of the Pagan World. This famous Greek was born in Egypt, and the great Roman Empire was already showing signs of decay, while Ptolemy was searching the great Alexandrian library for materials for his book. Alexandria was now the first commercial city of the world, second only to Rome. She supplied the great population in the heart of the Empire with Egyptian corn. Ships sailed from Alexandria to every part of the known world. It was, therefore, a suitable place for Ptolemy to listen to the yarns of the merchants, to read the works of Homer, Herodotus, Eratosthenes, Strabo, Pliny, and others, to study and observe, and finally to write.