Dust, atmospheric, i, 52-65; atmospheric, elimination methods, ix, 269; body handling of, 223-4; deep sea deposits, iii, 54-5; effects on light, i, 165, 183; electric precipitation, vii, 216, 301-2, 347; in cloud formation, i, 91; in fog formation, viii, 304; in stratosphere, i, 20, 144; meteoric (see Meteoric Dust); methods of measuring, i, 61-3; physiological effects, i, 325; volcanic (see Volcanic Dust); wind-carrying of, i, 52-5, iii, 71, 73, 75, xiii, 344 Dust Count, Chicago standard, viii, 332 Dust-counter, i, 62, 371 Dust Whirlwinds, i, 60 Dusty Trades, i, 325 Dutch Language, relations of, xv, 160, 162 Dutchman's-pipe Vine, xiii, 131-3 Dyes, Dyeing, ancient Egyptian, xvi, 72-3, 74; antiquity of use, xiii, 210; chemistry of, viii, 258-60, xvi, 163; coal tar, viii, 253-4; importance of industry, 253-4; purple, sources of, xii, 68, 72 Dynamic Electricity, vii, 367 Dynamic Heating and Cooling, i, 90 Dynamic Meteorology, i, 123, 371 Dynamite, viii, 261; blasting with, v, 100; invention, 380 Dynamo-Electric Machines, defined, vii, 367 Dynamometer, iv, 102, vii, 367 Dynamos, iv, 306-8, vi, 49-56; discovery of principle, 22, 50; function, 72; Gramme's, 26; interchangeability with motors, discovery of, iv, 54; invention and development, xvi, 189; parts, vii, 367; pole pieces, 374; separate and self-excited, vi, 186-7; source of energy, 129; submarine, double uses, v, 199; voltage, on what dependent, vi, 131 (see also Generators) Dynamotors, vii, 136-7 Dyne, unit of force, iv, 69-70 Dyrenforth, Gen. Robert, i, 338 Dysentery, amoebic, x, 195, 199; from water pollution, viii, 318; in tropics, x, 251, xv, 50; overheating and, x, 307 Dyspepsia, from tight lacing, x, 309; mental effects, xi, 369-70 Dysprosium, atomic weight and symbol, viii, 383 Eads, Captain, Mississippi River jetties, xiv, 270 Eagles, xii, 260, 261; bald-headed, unions among, xv, 277 Earache, in children, ix, 104 Ear-mindedness, xi, 222 Ears, ix, 100-3, xi, 98-102; basilar membrane of, iv, 203; cartilage in, ix, 57; direction perception by, 117, xi, 167-9; disorders and care of, ix, 103-4; equal size of, 169-70; equilibrium organs in, 89-90; hearing by, iv, 203-4 (see Hearing); infections of, ix, 61-2, x, 219; limits of hearing power, iv, 204, ix, 99, 100; liquids of inner, iv, 203; movements of, in animals, ix, 82, 117; mutilations of, by savages, xv, 259; nerve connections, ix, 124, 142, 143 (fig.); origin, xi, 109; outer, in hearing, ix, 117; reddening of, in cold, 311; receptor organs, attunement, xi, 62; ringing in, iv, 203; sensitiveness of, 204, 211-12, 360; static sense organs in, xi, 126; temperature of, ix, 93 Ear Trumpet, iv, 239