"During the following day we watched this crater with increasing vigilance in the hope of witnessing another of its stupendous exhibitions. The photographer kept his camera levelled upon the spot all day, and careful arrangements for triangulating the height of the column were also made. But though numerous indications of another eruption were observed at intervals by the rising of the water with violent ebullitions, no explosion occurred till about ten o'clock at night, when the grand performance was repeated. The spectacle by moonlight was truly sublime, but less satisfactory than in the day, since it was more difficult to distinguish between the column of water and the masses of vapor escaping with it. The interval between its eruptions was approximately determined as about twenty-nine hours; we therefore reasoned that it would play again at three o'clock the following night, and at eight on the succeeding morning. But we were doomed to disappointment; the eruption persisted in taking-place before daylight on the three succeeding nights, thus preventing the observations we so much desired to make." Two hundred yards below the Giant is the Grotto so named from the curious irregularity of its inclosing walls. It has an exceedingly intricate formation, with fantastic arches, pillars, and turreted sides, and discharges several times a day. Several of the first explorers crawled through the sinuous apertures when all was quiet. It seemed as harmless as curious then, but their opinion was changed slightly when they saw it an hour after throwing a column of water six feet in diameter to the height of sixty feet. Near it are several vents in which the water boils constantly to the height of six feet, large streams running down the banks into the river. Around the point of a hill a few hundred yards south of the Grotto, and partially concealed by a grove of pines, is a white cone twenty-five feet high and a hundred feet in diameter at the base. It has evidently been a geyser of considerable importance, but it now merely sends forth puffs of steam from a small orifice at the top. Near it is a quiet hot-spring with a most elegantly scalloped rim. Back of this Pyramid is the Punch Bowl, and still further south, the Black Sand Geyser, neither of which has been specially described.