This is the smallest of the basins, having few large geysers. Most of them are little ones, spurting every few minutes, and with some view to economy, whereby the water, after being blown out of the crater to a brief height, runs back into the orifice again, ready to be ejected by the next explosion. A mud geyser here throws up large quantities of dirty white paint in several spouting jets, the eruption continuing ten minutes, when nearly all the water runs back again, leaving the crater entirely bare, and its rounded, water-worn rocks exposed. The "Emerald Pool" is the wide crater of an old geyser, filled with hot water of a beautiful green color, constantly boiling, but never getting as far as an eruption. Probably the best geyser on exhibition in this basin is the "Minute Man," which, at intervals of about one minute, spouts for ten or twelve seconds, the column rising thirty feet, and the rest of the time it blows off steam. The "Vixen" is a coquette which is delightfully irregular, never going off when watched, but when the back is turned suddenly sending out a column sixty feet high. The great geyser here is the "Monarch," standing in a hill from which it has blown out the entire side, and once a day discharging an enormous amount of water over one hundred feet high, and continuing nearly a half-hour. Its column comes from two huge orifices, the surplus water running down quite a large brook. When quiet, this geyser industriously boils like a big tea-kettle. There are plenty of "paint pots" and sulphur springs, and the visitors coax up lazy geysers by throwing stones into them,--a method usually making the small ones go to work, as if angry at the treatment. THE LOWER AND MIDDLE BASINS.