We must observe also that the scientific men of the Middle Ages believed that the shores of Asia were not more than 6000 miles distant from those of Europe. Aristotle supposed the terrestrial globe to be smaller than it really is. Seneca said "How far is it from the shores of Spain to India? _A very few days' sail_, should the wind be favourable." This was also the opinion of Strabo. So it seemed that the route between Europe and Asia _must_ be short, and there being such places for ships to touch at as the Azores and Antilles, of which the existence was known in the fifteenth century, the transoceanic communication promised not to be difficult. This popular error as to distance had the happy effect of inducing navigators to try to cross the Atlantic, a feat which, had they been aware of the 15,000 miles of ocean separating Europe from Asia, they would scarcely have dared to attempt. We must in justice allow that certain facts gave, or seemed to give, reason to the partisans of Aristotle and Strabo for their belief in the proximity of the eastern shores. Thus, a pilot in the service of the King of Portugal, while sailing at 1350 miles' distance from Cape St. Vincent, the south-western point of the Portuguese province of Algarve, met with a piece of wood ornamented with ancient sculptures, which he considered must have come from a continent not far off. Again, some fishermen had found near the island of Madeira, a sculptured post and some bamboos, which in shape resembled those found in India. The inhabitants of the Azores also, often picked up gigantic pine-trees, of an unknown species, and one day two human bodies were cast upon their shores, "corpses with broad faces," says the chronicler Herrera, "and not resembling Christians." These various facts tended to inflame imagination. As in the fifteenth century men had no knowledge of that great Gulf-stream, which, in nearing the European coasts, brings with it waifs and strays from America, so they could only imagine that these various debris must come from Asia. Therefore, they argued, Asia could not be far off, and the communication between these two extremes of the old continent must be easy. One point must be clearly borne in mind, no geographer of this period had any notion of the existence of a new world; it was not even a desire of adding to geographical knowledge which led to the exploration of the western route. It was the men of commerce who were the leaders in this movement, and who first undertook to cross the Atlantic. Their only thought was of traffic, and of carrying it on by the shortest road.