30 



No. 2G2. The Grotto SPRING-. About two miles above the Crater Hills, 

 on the west side of the Yellowstone. A column of steam issu- 

 ing from a cave on the side of the hill, with an opening of 

 about live feet in diameter, readily locates its position. The 

 roaring of the waters in the cave, and the noise of the waves as 

 they Barge up to the mouth of the opening, are like that of 

 the billows Lashing the sea-shore. The water is as clear as 

 crystal, and the steam is so hot that it is only when a breeze 

 wafts ii aside for a moment, that one can venture to take a 

 look into the opening. 



No. 203. Crater of THE Mud Geyser. 



No. 264. Mud Geyser in action. The only true mud geyser discov- 

 ered, eight miles below Yellowstone Lake. It has a fun- 

 nel-shaped orifice in the center of a basin 150 feet in 

 diameter, and in which there are two other hot mud Springs. 

 The flow of the geyser is regular every six hours, the erup- 

 tions lasting about fifteen minutes. The thick, muddy water 

 rises gradually in the crater, commencing to boil about half 

 way to the surface, and occasionally breaking forth with 

 great violence. When the crater is filled it is expelled from 

 it in a splashing, scattered mass ten feet in diameter to forty 

 feet in height. The mud is a dark lead-color, and deposits 

 itself thickly all about the rim of the crater. 



No. 2G5. A MUD SPRiNOon the opposite side of the river, and of the same 

 nature as No. 261. 



No. 2GG. Yellowstone Kiver where it leaves the lake, looking- down 

 from the same stand point as the following. 



Nos. 2G7, 2GS. Yellowstone Lakh, looking south from where the river 

 leaves it, and showing the larger portion, or the body, of the 

 lake. It is some twenty-two miles long, from north to south, 

 and about ten or fifteen miles in width, from east to west, 

 with an elevation of 7,427 feet above tide water. 



In shape it is aptly compared to the human hand ; the 

 northern portion would constitute the palm, while the south- 

 ern arms might represent the lingers. Careful soundings gave 

 the greatest depth at .'500 feet. When calm, the waters reflect 

 the sky in the most delicate and beautiful ultramarine hues, 

 but when stormy, and lashed by the strong winds of this high 

 altitude, it resembles in its white-capped breakers and heavy 

 rolling surf some of our larger inland seas. The lake is plenti- 

 fully stocked with salmon-trout, their numbers being almost 

 incredible, and will average two pounds in weight. 



No. 2G8. First camp of the survey, upon the banks of the lake, at the 

 mouth of Bridge Greek, and just opposite Stevenson's Island. 



Nos. 2G9-272. Camp of the strvev and of their escort, upon the large 

 southwest arm of the lake. 



No. 273. The Anna, the first boat ever launched upon the lake. Its 

 frame-work was brought up from Fort Ellis and then put to- 

 gether, and covered with tar-soaked canvas. A tent-fly made 

 the sail. In it two adventurous members of the survey visited 

 every arm and nook of the lake, and made all the soundings. 

 It is so named in compliment to Miss Anna Dawes, a daughter 

 of the distinguish statesman whose generous sympathy and 

 aid have done so much toward securing these results. 



No. 274. A view alono TnE southwest arm of the lake, looking 

 north from the camp. The shore is covered to a considera- 



