Mackenzie, theory of geyser action, 166. Madison Lake, 237, 333. Madison Plateau, 153. Madison River, 150. Madison Valley, 154. Mammoth Hot Springs, buildings at, 209, 216. described, 173, 212. discovery of, 26, 85. Mandan Indians, 1, 2, 4. Mann, Charles, member of Radersburg Tourist party, 112. Map of Y. N. P., vii. Map, Raynolds', 63. Marten traps, discovery of cache of, 41. Mason, Major J. W., commands escort to Governor Hoyt, 106. Maynadier, Lieutenant, commands detachment of Raynolds Party, 59, 60. quoted, 62. McCartney, C. J., attacked by Nez Percés, 123. McCartney Cave, 214. Meek, Joseph, adventures of, 42. Members of Congress from States near Park, 282-3. Mexico, war with, 39, 100. Middle Gardiner Falls and Cañon, 215. Midway Geyser Basin, 226. Mileage of Park Road System, 202. Miles, General N. A., intercepts and captures Nez Percés, 124. Mineral Springs of the Y. N. P., therapeutic value of, 199 Minerva Terrace, 214. Minnetaree, Indian dialect, 7. Minute Man, 220. Mirror Plateau, 153. Missouri Fur Co., 29, 35. _Missouri Gazette_, extract from, 21, 23. Missouri River, 1, 4, 150, 188. Missouri River, fur trade along, 35. _Mi tsi a-da-zi_, Indian name for Yellowstone, 7. Monarch Geyser, 220. Montana Territory, becomes a state, 288. early explorations in, 3. emigration to, 66. population of, in 1862, 66. Monument Geyser Basin, 221. Monument, survey, 248. Moore, Charles, sketches by, 168. records height of Falls, 326. Moran, Thomas, painting by, 256. quoted, 256. Mormon emigration, 39, 100. Morning Glory, 229. Mound, artificial in Y. N. P., 12. Mountain sheep of Y. N. P., 216. Mountain stream of hot water, Bridger's story, 55. Mountain Systems of the West, formation of, 156. of the Y. N. P., 151, 152. Mud Geyser, Norris Geyser Basin, 220. Y. River, 249, Mud Volcano, 248. Mystic Fall, 228.