Columbus went back to Porto Santo with his ambitions thoroughly kindled. He had been given a definite command in the Portuguese Navy; he had been sailing with a fleet; he had been down to the mysterious coast of Africa; he had been trafficking with strange tribes; he had been engaged in a difficult piece of navigation such as he loved; and on the long dreamy days of the voyage home, the caravels furrowing the blue Atlantic before the steady trade-wind, he determined that he would find some way of putting his knowledge to use, and of earning distinction for himself. Living, as he had been lately, in Atlantic seaports overlooking the western ocean it is certain that the idea of discovering something in that direction occupied him more and more. What it was that he was to discover was probably very vague in his mind, and was likely not designated by any name more exact than “lands.” In after years he tried to show that it was a logical and scientific deduction which led him to go and seek the eastern shore of the Indian continent by sailing west; but we may be almost certain that at this time he thought of no such thing. He had no exact scientific knowledge at this date. His map making had taught him something, and naturally he had kept his ears open, and knew all the gossip and hearsay about the islands of the West; and there gradually grew in his mind the intuition or conviction--I refuse to call it an opinion--that, over that blue verge of the West, there was land to be found. How this seed of conviction first lodged in his mind it would be impossible to say; in any one of the steps through which we have followed him, it might have taken its root; but there it was, beginning to occupy his mind very seriously indeed; and he began to look out, as all men do who wish to act upon faith or conviction which they cannot demonstrate to another person, for some proofs that his conviction was a sound one.