Face, profile of in Absaroka Range, 293. Fairy Fall, 226. Falls River, 151. Basin, 154. Falls of the Yellowstone described, 251, 254. measurement of, 80, 105, 325-6. not on Colter's map, 27. Fan Geyser, 229. Fauna of the Y. N. P., 181. Fearless Geyser, 220. Firehole Cascade, 222. Spring, 225. River, 43, 150. Fish Commission U. S., work of, in Y. N. P., 186. Fishes of the Y. N. P., 185, 186. Fishing Cone, story of, 56. Fishing Cone, west shore Y. Lake, 242. Fishless streams of the Y. N. P., 186. Flora of the Y. N. P., 187. Flow of water from Y. N. P., 190. Flowers of the Y. N. P., 190. Foller, August, member of Helena tourist party, 112. Folsom, D. E., 73. article by, in _Western Monthly_, 74. measures Falls of the Y., 325. quoted, 160, 241, 256. suggests Park idea, 91. Folsom Expedition, 72-4. Forbes, S. A., quoted, 246. Ford of the Y. River at Mud Geyser, 26, 249. at Tower Creek, 261. _Forest and Stream_, 145, 281, 383. Forest Reserve, 148. Forests of the Y. N. P., economic value of, 188. effect of railroads upon, 272. extent of, 187. preservation of, 207. Formations about geysers, 169. Fort Yellowstone, 208, 216. Fossil Forests of the Y., 177-180, 263. Fountain Geyser, 167, 223. Fountain geysers, 167. Fountain Hotel, 223. "Free trappers," 37. French name for Y. River, 2, 7. French and Indian War, 4. Friends of the Y. N. P., 281. Frying Pan, 219. Funds for the Y. N. P.; lack of, 128. Fur companies, growth and history, 32-36. territory controlled by, 37. Fur trade, climax in, 32, 39. competition in, 38. decline of, 39, 100. in its relation to western exploration, 32, 99, 100.