Sheep, mountain, 64; a flock descending a mountain, 23-28; as acrobats, 24; fable as to landing on horns, 28, 29; shape and size of horns, 29, 30; a wild leap, 30-32; accidents, 32, 33; an agile ram, 33-35; hoofs, 35; size, color, and other characteristics, 35, 36; species and range, 36, 37; in winter, 37; excursions to the lowlands, 37, 38; composition of flocks, 38; craving for salt, 38; lambs, 38, 39; near approach to, 40; a ram killed by a barbed-wire fence, 40, 41; the flock on Battle Mountain, 41-46; fights, 44-46; threatened extermination, 46; at high altitudes, 105-107; watching a forest fire, 142; clings to the heights in snowy times, 266, 267. Shoshone Peak, 339. Silver Lake, 157. Silverton, 171. Snow, on summits of the Rocky Mountains, 103; and animal life, 259-275; a great snow, 268; and the Chinook wind, 269. Snow-slides, started by dynamite, 79; a prospector outwitted, 79-84; habits, 81; observation of, 84-86; classification, 87-90; coasting on a slide, 91-94; a large slide, 94-97. Solitaire, Townsend's, 64, 154, 241. South Cheyenne Cañon, 298-300. South Park, 229. Sparrow, white-crowned, 64, 102, 115, 154. Specimen Mountain, 38, 335, 337, 343, 344. Sprague Glacier, 153, 337. "Springfield Republican," quoted, 230, 231. Spruce, Douglas, 140. Spruce, Engelmann, 61. Squirrel, Frémont, or pine, 64, 344. Squirrels, and deep snow, 270, 271; hibernation, 271. Stone's Peak, 338, 341. Storm Peak, 349. Switzerland, conservation of scenery in, 313-315, 323, 327. Telluride, 171, 172, 174-176, 183. Thatch-Top Mountain, mountain sheep on, 23-28. Thunder Lake, 157, 158. Timber-line, characteristics of, 49-58; altitude, 50, 59, 60, 101; determining factors, 58, 59; temperature, 60; species of trees at, 60, 61; age of trees at, 61, 62; animal life at, 63, 64; flowers at, 65; impressions at, 65, 66; animal life above, 101, 102, 105-115; flowers above, 116-120. Trapper's Lake, 157. Trees, species at timber-line, 60; age at timber-line, 61, 62; resistance to fire, 128-130; methods of reproduction, 214-216; tolerance and intolerance, 216-218; of Pike's Peak, 308. _See_ also Timber-line. Trout Lake, 157, 176. Twin Lakes, 157. Tyndall, John, 18. Tyndall Glacier, 338. Wasp, battle with a beetle, 111. Weasels, above timber-line, 111, 112; and chipmunk, 285. Wild Basin, 338, 341; description, 350. Willow, arctic, 61. Willow, propagation, 215. Wolves, 266, 268. Woodchuck, above timber-line, 109. Woodpeckers, 273. Yarding, 262-265. Yellowstone National Park, establishment of, 329. Zones, life, 305, 306. The Riverside Press CAMBRIDGE . MASSACHUSETTS U . S . A