2-i 



No. 178. Snake River. Looking apfrom Taylor's bridge, twenty-six 

 miles west from Fort Hall. The river here rushes through a 

 narrow channel of dark, nearly black basalt. Our view was 

 taken in the spring, when the channel was lull. In the fall, 

 when the river is low, it reveals deep canon like walls, about 

 100 feet below the surface. 



No. 170. POT-HOLES. A portion of an old channel of the river through 

 the basalts, and showing how curiously they were hollowed 

 out of the iron-like rock by the action of the water. They 

 exist by thousands on both sides and up and down the river. 

 They are particularly noticeable in this old channel. 



No. 18(1. PLEASANT GALLEY, Idaho. A small valley, of not more than 

 200 acres in extent, just south of the main Kocky Mountain 

 divide. It is 275 miles north fromOgden; elevation, 6,236 

 feet. The divide is four miles to the north, and is but 250 

 feet higher. 



Nos. 181, 182, 183. |iED ROCK MOUNTAINS, from the junction on the 

 overland stage line, 293 miles from Ogden ; elevation of val- 

 ley, 6,329 feet. They are a portion of the main Kocky Moun- 

 tains divide, separating Idaho from Montana. 



No. 184. Mount Garfield. The highest summit in the Eed Book 

 Mountains, being 0,7()l feet above th/e sea. 



No. 185. A view in the Devil's PASSWAY, showing a portion of the 

 canon through quartzites and sand-stone, with a basaltooping. 



No. 186. GAMP ON the PASSAMUtE, or Stinking Water, one of the main 

 branches of the Jefferson, showing a glimpse of the snow-clad 

 mountains bordering the Madison, among - which are its 

 sources. 



No. 187. Virginia City, Mont. Elevation, 5,713 feet, near the foot of 

 Alder Gulch, one of the richest plaeer-mining districts in 

 Montana, discovered in L863. The town dates its existence 

 from that time. The view is from across the gulch, looking 

 north. 



No^. 183, 180, 100. HYDRAULIC BONING NEAR VIRGINIA ClTY. Alder 

 Gulch is sixteen miles in Length, rising in the mountains near 

 Madison River to an altitude of 7,500 feet. The two first 

 views show the manner of washing away the sides of the 

 gulch into the slnice-boxes, where the gold is collected. In 

 No. 100, a Hume is laid upon the bed-rock, in the bottom of the 

 gulch, and the waters of the creek brought through it, carry- 

 ing with its current the auriferous sands. 



No. 101. Bridge over the Madison, about half way between Virginia 

 City and Bozeman. The Madison is one of the three streams 

 that unite to form the Missouri. 



No. 102. Fort Ellis, Mont. One of the largest and most important 

 military posts in the Northwest, situated on Mill Creek, about 

 three miles above Bozeman, at the head of Gallatin Valley. 

 It is the rendezvous and outfitting point for the exploration 

 of the "Wonder Land" lying beyond. 



No. 103. A Group of the officers at Fort Ellis, July, 1871. 



Nos. 101, 105. Camps of the SURVEY, near Fort Ellis, preparatory to 

 moving over on the Yellowstone. 



No. 10G. Mystic Lake. A picturesque little sheet of water of about 



•fifty acres extent, the head of Bozeman Greek, and one of the 



branches of the East Gallatin, it is about twelve miles south 



