There is no doubt that there was a general feeling, at the period when Columbus and Correo lived at Porto Santo, that the discovery of either a continent on the western shore of the Atlantic, or a new route to China, would meet a great popular want. Although the Portuguese had sailed as far south as Cape Bojador, they believed that no vessel could sail any further in that direction without meeting with a temperature so great as to raise the water of the ocean to the boiling-point, and it was thus assumed that all future navigators desirous of new islands and continents must search for them in the west. The more Columbus thought of the matter, the more firmly he became convinced that he could either discover valuable islands by sailing due west, or that at all events he could reach the coast of Japan, China, or India; and that it was clearly the duty of somebody to supply him with ships and money and put him in command of an exploring expedition. With this view Correo fully coincided, and Columbus made up his mind that he would call on a few respectable kings and ask them to fit out such an expedition. [Æt. 34; 1474] Fernando Columbus informs us that his father based his conviction that land could be found by sailing in a westerly direction, upon a variety of reasons. Although many learned men believed that the earth was round, the circumference of the globe was then unknown; and as every one had therefore a right to call it what he chose, Columbus assumed that it was comparatively small, and that the distance from the Cape Verde Islands eastward to the western part of Asia was fully two thirds of the entire circumference. He also assumed that the remaining third consisted in great part of the eastern portion of Asia, and that hence the distance across the Atlantic, from Portugal to Asia, was by no means great. In support of this theory he recalled the alleged fact that various strange trees and bits of wood, hewn after a fashion unknown in Europe, had from time to time been cast on the European shores, and must have come out of the unknown west. This theory, founded as it was upon gratuitous assumptions, and supported by driftwood of uncertain origin and doubtful veracity, was regarded by Columbus as at least the equal of the binomial theorem in credibility, and he felt confident that the moment he should bring it to the attention of an enterprising king, that monarch would instantly present him with a fleet and make him Governor-General of all lands which he might discover.