H., first white woman to visit Park, 340. Streams of Y. N. P., fish in, 186. Strong, Gen. W. E., accompanies Secretary Belknap to Y. N. P., 105. Stuart, James, 65, 70. Sturgis, General S. D., attacks Nez Percés, 124. fails to intercept Nez Percés, 124. Sublette Lake, early name for Y. Lake, 335. Sublette, William, fur trader, 36. Subterranean heat, origin of, 158. Sulphur Mountain, 249. Spring, 250. Superintendents of the Park, duties of, 206, 207. list of, 359. Swan Lake, 217. Flats, 154. Talmage, T. DeWitt, quoted, 253, 257. Temperatures in Y. N. P., 198. Terraces, formation of, 173, 212. Terrace Mountain, 215. Tertiary Period in Y. N. P., 156. Teton, Grand. See _Grand Teton_. Teton Pass, 24. Teton Range, 152, 222, 243. Therapeutic value of springs in Y. N. P., 199. Thermal activity in Y. N. P. not diminishing, 160. Thermal springs, geographical distribution of, 160. Third Cañon of the Y., 266. Thompson, David, and name "Yellowstone," 1, 2. and source of Y. River, 2. Thumb of Y. Lake, 241, 335. Topping, E. S., quoted, 313, 315. Tour of the Y. N. P., best season for, 210. Tourists and wild animals in Y. N. P., 184. Tourists' season in Y. N. P., 193. Tower Falls, 261. discovered, 78. Transportation in the Y. N. P., 204. Trappers ignorant of geyser regions, 99. Treaties with Indians, 18, 19. Tree inscribed with date 1819, 40, 251. Trees of Y. N. P., 187. Trout Creek, serpentine course of, 249. Trout in Y. Lake, 186. Trumbull, Walter, member Washburn Party, 76. publications by, 83, 84. sketches by, 169. _Tukuarika_, native name for Sheepeater Indians, 8, 10. Turban Geyser, 230. Turquoise Spring, 227. Twin Buttes, 225. Twin Lakes, 219. Two-Gwo-Tee Pass, 105. Two-Ocean Pass, 59, 105, 245, 333. crossed by fish, 186. discovered, 104, 245. Tyndall, John, quoted, 174. Union Geyser, 167, 239. Pass, 23, 59. U. S. Geological Survey, explorations under, 103. measurements by, of height of Falls, 326. names by, in Y. N. P., 286. Unknown visitor to geyser basins in 1833, 14, 44. Upper Fall of the Y., 251. Upper Geyser Basin, 228. discovery of, 82. visited in 1833, 44. Valleys of the Y. N. P., 153. Vandalism in the Y. N. P., 207. Verendrye, Chevalier de la, explorations of, 4. Vest, Senator G. C., connection of with Y. N. P., 281. member Presidential party, 1883, 107. quoted, 282. Virginia Cascade, 220. Visitors to Y. N. P. in 1883, 107. Vixen Geyser, 220. Volcanic rocks in Y. N. P., 157.