Jews, of Asia and Europe, xvi, 64; circumcision, untransmitted, x, 230; history in relation to Ghor of Syria, xiv, 121; immunity from trichina, xv, 49; polygamy among, 289; prepotency in crosses, x, 230 Jew's Harp, iv, 232 Jibon River, Salvador, xiv, 198 Jihar River, xiv, 185 John Daniel, orang-utan, xvi, 25 "John H. Grindle", (fish), xii, 152 John of Gaddesden, x, 41 Johns Hopkins Hospital and Medical School, x, 151, 172 Johnson, Prof. D. W., coast classification, xiv, 253; on climatic changes, 361 Johnson, Samuel, compared with Paracelsus, x, 48; on Heberden, 104 Johnstown Flood, iii, 31 John the Baptist, locusts and honey of, xv, 134 Joints, arm and hand, ix, 67; diseases of, x, 224-5; dislocation of, ix, 71; fastening at, 70-1; hip, 67, 71; motion sense in, ix, 90; muscles to move, 76-7; sensations of, xi, 124-5, 128; shoulder, ix, 66, 71 Joints, Joint Blocks (geology), iii, 23, 379, xiv, 128-30; illustration, iii, 144 (Pl. 8); residual cores, iii, 32 (Pl. 1); topography and drainage effects, xiv, 130-3; various examples, iii, 48, 49-50, 65 Joint Worms, xii, 125 Joliet, expedition of, xiv, 192 Joplin, Mo., mining district, iii, 362, 364 Jordan Engine, v, 294-5 Jordan River, base level of, xiv, 164 Jordan Valley, iii, 151, xiv, 118, 120, 167 Jorullo, Mexico, xiv, 320 Joule, electrical energy unit, iv, 284, 294, 310, 312, vii, 370; used as heat unit, 369; erg and calorie equivalents, 382; work or energy unit, iv, 80 Joule, James Prescott, energy unit named for, iv, 284; heat experiments of, 49-50; mechanical equivalent of heat, xvi, 131-3 Joule-Thomson Effect, i, 30 Joy Stick, i, 299 Judæa, Wilderness of, xiv, 121 Judaism, development of, xv, 199 Jumping Hare, xii, 290 Juniper, a conifer, xiii, 174; in landscaping, 270; spread by buds, 340 Junker Engine, v, 163-4 Jupiter (planet), ii, 260-3; atmosphere, 249, 261; comet families, 271; disturbing effect on asteroids, 258; "great inequality," 87; habitability of moons, 250; life on, ii, 248-9; lucid planet, 249, 261; photographic studies, 132-3; rotation period, 377; satellites, 261-3; satellites, discovery of, 54, 83, 94, 110, 267; size and orbit, 162, 163; weight, 76, 77 "Jupiter", U. S. collier, vii, 326 Jura Mountains, xiv, 93-4; age of, 232; folding of, 36, 93-4, 229-30; little metamorphism in, 234; streams of, 94, 95, 157, 167 Jurassic Period, iii, 213-14; Age of Reptiles, xv, 71; animal and plant life in, iii, 20, 255, 270, 276, 289, 295; flies of, xii, 104 Juries, as crowds, xi, 326 Justifying (printing), v, 308; on linotype, 310; on monotype, 311-12 Jute, cellulose composition, viii, 254; uses and production, xiii, 241-3; economic importance, 208 Juvenile Water, xiv, 151-2