32 



No. 29.3. The Hidden Lake, within a quarter of a mile of Yellowstone 

 Lake, and near the cam p in No. 269. It is about a mile in length, 



entirely hidden among the dense pines, and might easily es- 

 cape notice. 



THE UPPER GEYSER PASIN. 



On Fire Hole River, a tributary of, and sometimes called, 

 the Madison, are the principal ones of the famed spouting 

 geysers. Our time being very limited indeed, we only have 

 a few views of the craters of the most noted geysers. For 

 a more extended list, .see catalogue for 1872. 



No. 294. Crater of the Castle Geyser. Bearing a strong resem- 

 blance to an old castle, but of the purest white marble. 

 This view, taken from the side opposite the river, shows the 

 main portion to be composed of very thin lamime of silica. 



Ho. 396. Chater of Castle &BYSBR. A view from the river side. 

 Here we see the peculiar crystallization of the silica in large 

 globular masses, like spongiform corals, and running oil' into 

 the usual exquisite bead-work to the laminated base. The 

 entire mound is about forty feet in height. On the right, 

 close to its base, is a small but very active and turbulent 

 little geyser, probably an offshoot from the greater one. In 

 the center of the view, and the most striking object in it, is 

 the beautiful hot spring, with elegantly carved border and 

 water of the clearest turquois blue. It is nearly circular, 

 about twenty-live feet in diameter, and funnel-shaped, pass- 

 ing down to a depth of sixty feet in the center. The water 

 is of almost unnatural clearness, and the varying depth gives 

 a most beautiful gradation of color. It has a constant tem- 

 perature of 172 degrees. 



No. 29G. Crater of the Giant, located about a quarter of a mile 

 below the Castle. It is about ten feet in diameter at its base 

 and twelve in height, with an orifice of about three feet in 

 diameter. It projects a column of water to a height of from 

 125 to 150 feet, the eruptions lasting about two hours. 



No. 297. Crater of the Grotto, a few rods below the Giant, and en- 

 sconced in a grove of trees. It differs externally from all the 

 other craters, but, like them, consists of a mass of silicious 

 sinter, twelve feet in diameter and five feet high, full of large 

 sinuous orifices, from which the water is projected during an 

 eruption. 



No. 29S. The grotto in ERUPTION, throwing an immense body of 

 water, but not more than forty feet in height. The great 

 amount of steam given off almost entirely conceals the jets 

 of water. 



No. 299. Camp upon the summit of the DIVIDE, between the head 

 of the East Fork and the main Yellowstone, by the side of a 

 little lake, 8,500 feet above the sea. 



No. 300. Another view of the same lake. 



No. 301. The ODOMETER, made by attaching a pair of shafts to the fore 

 wheels of an ambulance, to the spokes of which were attached 

 the instruments that recorded their revolutions, and measured 

 the surface of the country over which we passed. These were 

 the first wheels that were ever taken into this little-known 

 region. 



