Thanks to the lofty walls of the crater, which penetrate the clouds and condense their moisture, the land is watered with many streams. These flow into the central lake, which discharges into the surrounding ocean by a rift or chasm in the mountain side. Moreover, there are frequent showers, and heavy dews by night, to refresh the surface of the ground. Thunderstorms occur on the tops of the mountain and in the open sea; but very seldom within the enchanted girdle of the crater. The air is remarkably pure, sweet, and exhilarating, owing doubtless to the high percentage of oxygen it contains, and the absence of foreign matter, such as microbes, dust, and obnoxious fumes. In fact, we all felt a distinct improvement in our health and spirits, a kind of mental intoxication which was really more than a rejuvenescence. Nor was the heat very trying, even in the middle of the day, because although the sun was twice as large as on the earth, he did not rise far above the horizon, and cooling breezes blew from the chilled summit of the cliffs. The vegetation seems to go on budding, flowering, and fruiting perpetually, as in the Elysian Fields of Homer, where "Joys ever young, unmixed with pain or fear, Fill the wide circle of the eternal year: Stern winter smiles on that auspicious clime The fields are florid with unfading prime; From the bleak Pole no winds inclement blow, Mould the round hail, or flake the fleecy snow; But from the breezy deep the blessèd inhale, The fragrant murmurs of the western gale."