I was called on deck to stand my watch at about three in the morning, and I shall never forget the peculiar sensation which I experienced on finding myself once more surrounded by land, feeling the night-breeze coming from off shore, and hearing the frogs and crickets. The mountains seemed almost to hang over us, and apparently from the very heart of them there came out, at regular intervals, a loud echoing sound, which affected me as hardly human. We saw no lights, and could hardly account for the sound, until the mate, who had been there before, told us that it was the ``Alerta'' of the Chilian soldiers, who were stationed over some convicts confined in caves nearly half-way up the mountain. At the expiration of my watch, I went below, feeling not a little anxious for the day, that I might see more nearly, and perhaps tread upon, this romantic, I may almost say classic, island. When all hands were called it was nearly sunrise, and between that time and breakfast, although quite busy on board in getting up water-casks, &c., I had a good view of the objects about me. The harbor was nearly land-locked, and at the head of it was a landing, protected by a small breakwater of stones, upon which two large boats were hauled up, with a sentry standing over them. Near this was a variety of huts or cottages, nearly a hundred in number, the best of them built of mud or unburnt clay, and whitewashed, but the greater part Robinson Crusoe like,-- only of posts and branches of trees. The governor's house, as it is called, was the most conspicuous, being large, with grated windows, plastered walls, and roof of red tiles; yet, like all the rest, only of one story. Near it was a small chapel, distinguished by a cross; and a long, low, brown-looking building, surrounded by something like a palisade, from which an old and dingy-looking Chilian flag was flying. This, of course, was dignified by the title of Presidio. A sentinel was stationed at the chapel, another at the governor's house, and a few soldiers, armed with bayonets, looking rather ragged, with shoes out at the toes, were strolling about among the houses, or waiting at the landing-place for our boat to come ashore. The mountains were high, but not so overhanging as they appeared to be by starlight. They seemed to bear off towards the centre of the island, and were green and well wooded, with some large, and, I am told, exceedingly fertile valleys, with mule-tracks leading to different parts of the island.