It was the Northmen who, in huge open boats, pushed off without chart or compass (for neither existed at that time) into the tempestuous northern seas, and, in the year 863, discovered the island of Iceland; in 983, the coast of Greenland; and, a few years later, those parts of the American coast now called Long Island, Rhode Island, Massachusetts, Nova Scotia, and Newfoundland. It is true they did not go forth with the scientific and commercial views of Columbus; neither did they give to the civilised world the benefit of their knowledge of those lands. But although their purpose was simply selfish, we cannot withhold our admiration of the bold, daring spirit displayed by those early navigators, under circumstances of the greatest possible disadvantage-- with undecked or half-decked boats, meagre supplies, no scientific knowledge or appliances, and the stars their only guide over the trackless waste of waters. In the course of time, one or two adventurous travellers pushed into Asia, and men began to ascertain that the world was not the insignificant disc, or cylinder, or ball they had deemed it. Perhaps one of the chief among those adventurous travellers was Marco Polo, a Venetian, who lived in the latter part of the thirteenth century. He made known the central and eastern portions of Asia, Japan, the islands of the Indian Archipelago, part of the continent of Africa, and the island of Madagascar, and is considered the founder of the modern geography of Asia. The adventures of this wonderful man were truly surprising, and although he undoubtedly exaggerated to some extent in his account of what he had seen, his narrations are for the most part truthful. He and his companions were absent on their voyages and travels twenty-one years. Marco Polo died; but the knowledge of the East opened up by him, his adventures and his wealth, remained behind to stir up the energies of European nations. Yet there is no saying how long the world would have groped on in this twilight of knowledge, and mariners would have continued to "hug the shore" as in days gone by, had not an event occurred which at once revolutionised the science of navigation, and formed a new era in the history of mankind. This was the invention of the mariner's compass. CHAPTER FIVE. THE MARINER'S COMPASS--PORTUGUESE DISCOVERIES. "What _is_ the compass?" every philosophical youth of inquiring disposition will naturally ask. We do not say that all youths will make this inquiry. Many there are who will at once say, "Oh, I know! It's a needle with a card on the top of it--sometimes a needle with a card under it--which always points to the north, and shows sailors how to steer their ships."