Iceland, thermal springs of, 161. Idaho, admission of, to Union, 282. Indians and name Yellowstone, 3, 7, 16. implements of, in Y. N. P., 12. knowledge of, concerning the geyser regions, 8, 13-17, 98. title of, to Y. N. P., 19. traditions of, concerning Y. N. P., 16. trails of, in Y. N. P., 11, 12, 13. treaties with, 18, 19. tribes of, near Y. N. P., 8. visits of, to Park country, 17. Inscription on pine tree near Grand Cañon, 40, 251. Inspiration Point, 254. Invalids at Mammoth Hot Springs in 1871, 200, 212. Irving, Washington, quotes Bradbury, 28. Isa Lake, 238. Islands of Y. Lake, 335. Itasca State Park, 97. Jackson, David, fur trader, 36. Jackson Lake, first named by Wm. Clark, 24, 331. discovered, 24. mentioned, 152, 222. Jackson, W. H., photographer in Y. N. P., vii. Jefferson Fork, scene of Colter's adventure, 29. Jefferson, Thomas, 1. Jewel Geyser, 228. Jones Creek, 104. Jones, Captain W. A., discovers and names Two-Gwo-Tee Pass, 105. discovers Two-Ocean Pass, 104, 245. expedition of, 15, 104. first to cross Absaroka Range, 104. measures Y. Falls, 326. names mountains east of Park, 289. quoted, 6. Joseph, Non-treaty Nez Percé chief, 113, 126. estimate of his character, 301. Joseph Peak, 217. Junction Butte, 261. Junction Valley, 154, 263. Jupiter Terrace, 214. _Kansas City Journal_, editor of, rejects Bridger's statements, 53. Kenck, Charles, member Helena Tourist Party, 112. killed by Nez Percés, 122. Kepler Cascade, 237. Killing of game in Y. N. P. prohibited, 134. Kingman, Lieutenant D. C., prepares project for Park road system, 140. quoted, 271. reports of, 140. Kingman Pass, 215.