. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SUEVEY OF THE TERRITOEIES. 125 the geysers of this basin. I have therefore left undescribecl many as interesting as those noticed in the preceding pages. On our return to the lake from this basin, we passed up the Fire-Hole Eiver to its source in the divide. Early in the morning, as we were leaving the valley, the grand old geyser which stands sentinel at the head of the valley gave us a magnificent parting display, and with little or no preliminary warning it shot up a column of water about 6 feet in THE B EE-HIV E. diameter to t
. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SUEVEY OF THE TERRITOEIES. 125 the geysers of this basin. I have therefore left undescribecl many as interesting as those noticed in the preceding pages. On our return to the lake from this basin, we passed up the Fire-Hole Eiver to its source in the divide. Early in the morning, as we were leaving the valley, the grand old geyser which stands sentinel at the head of the valley gave us a magnificent parting display, and with little or no preliminary warning it shot up a column of water about 6 feet in THE B EE-HIV E. diameter to the height of 100 to 150 feet, and by a succes- sion of imi3ulses seemed to hold it up steadily for the space of fifteen minutes, the great mass of water falling directly back into the basin, and flowing over the edges and down the sides in large streams. When the action ceases, the water recedes be- yond sight, and nothing is heard but the occasional es- cape of steam until another exhibition occurs. This is one of the most accommodating geysers in the basin, and during our stay played once an hour quite regularly. On account of its apparent regularity, and its position overlooking the valley, it was called by Messrs. Langford and Doane "Old ; It has built up a crater about 20 feet high around its base, and all about it are decorations similar to those previously de- scribed. On the morning of August 6, we ascended the mountains at the head of Fire-Hole Eiver, on our return to the hot-spring camp on the Yellow- stone Lake. We had merely caught a glimpse of the wonderful physical phenomena of this remarkable val- ley. We had jnst barely gleaned a few of the surface observations, which only sharpened our desire for a larger knowledge. There is no doubt in my mind that these geysers are more i>owerful at certain seasons of the year than at others. We saw them in midsummer, when the sur- face waters are greatly diminished. In the spring, at the time of the mel
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