From these islands to the south sea, the strait becomes very crooked and narrow, so that sometimes, by the interposition of headlands, the passage seems shut up, and the voyage entirely stopped. To double these capes is very difficult, on account of the frequent alterations to be made in the course. There are, indeed, as Magellan observes, many harbours, but in most of them no bottom is to be found. The land, on both sides, rises into innumerable mountains; the tops of them are encircled with clouds and vapours, which, being congealed, fall down in snow, and increase their height by hardening into ice, which is never dissolved; but the valleys are, nevertheless, green, fruitful, and pleasant. Here Drake, finding the strait, in appearance, shut up, went in his boat to make further discoveries; and having found a passage towards the north, was returning to his ships; but curiosity soon prevailed upon him to stop, for the sake of observing a canoe or boat, with several natives of the country in it. He could not, at a distance, forbear admiring the form of this little vessel, which seemed inclining to a semicircle, the stern and prow standing up, and the body sinking inward; but much greater was his wonder, when, upon a nearer inspection, he found it made only of the barks of trees, sewed together with thongs of sealskin, so artificially, that scarcely any water entered the seams. The people were well shaped and painted, like those which have been already described. On the land they had a hut built with poles, and covered with skins, in which they had water-vessels, and other utensils, made likewise of the barks of trees. Among these people they had an opportunity of remarking, what is frequently observable in savage countries, how natural sagacity and unwearied industry may supply the want of such manufactures or natural productions, as appear to us absolutely necessary for the support of life. The inhabitants of these islands are wholly strangers to iron and its use, but, instead of it, make use of the shell of a muscle of prodigious size, found upon their coasts; this they grind upon a stone to an edge, which is so firm and solid, that neither wood nor stone is able to resist it.