At half-past eight in the evening I had the good fortune to see one of these eruptions, and needed not, as I had done at the great Geyser, to bivouac near it for days and nights. The eruption lasted some time, and was tolerably equable; only sometimes the column of water sank a little, to rise to its former height with renewed force. After forty minutes it fell quite down into the basin again. The stones we threw in, it rejected at once, or in a few seconds, shivered into pieces, to a height of about 12 to 15 feet. Its bulk must have been 1 to 1.5 feet in diameter. My guide assured me that this spring generally plays only twice, rarely thrice, in twenty-four hours, and not, as I have seen it stated, every six minutes. I remained near it till midnight, but saw no other eruption. This spring very much resembles the Strukker near the great Geyser, the only difference being that the water sinks much lower in the latter. The second of the two remarkable springs, the arched spring, is situated near the little Geyser, on the declivity of a hill. I had never seen such a curious formation for the bed of a spring as this is. It has no basin, but lies half open at your feet, in a little grotto, which is separated into various cavities and holes, and which is half-surrounded by a wall of rock bending over it slightly at a height of about 2 feet, and then rises 10 to 12 feet higher. This spring never is at rest more than a minute; then it begins to rise and boil quickly, and emits a voluminous column, which, striking against the projecting rock, is flattened by it, and rises thence like an arched fan. The height of this peculiarly-spread jet of water may be about 12 feet, the arch it describes 15 to 20 feet, and its breadth 3 to 8 feet. The time of eruption is often longer than that of repose. After an eruption the water always sinks a few feet into the cave, and for 15 or 20 seconds admits of a glance into this wonderful grotto. But it rises again immediately, fills the grotto and the basin, which is only a continuation of the grotto, and springs again. I watched this miraculous play of nature for more than an hour, and could not tear myself from it. This spring, which is certainly the only one of its kind, gratified me much more than the little Geyser. There is another spring called the roaring Geyser; but it is nothing more than a misshapen hole, in which one hears the water boil, but cannot see it. The noise is, also, not at all considerable. July 3d.