text:  The first of these great headlands mariners know full well is a fearful barrier advancing into the cheerless deep amidst storms rocks islands and currents to avoid which the navigator is often compelled to go several degrees more to the south than his track requires; whereby the voyage is not only lengthened but his water and provisions so far exhausted that frequently he is under the necessity of making the first port he can in Chili or seeking safety on the African coast