Calcium, viii, 148-9; affinities, 31-2, 101-2, 128; atomic weight and symbol, 383; compounds, 130, 138, 149-53, 195; compounds in hard water, 318, 322-4; electrolytic production, vii, 320-1; fusibility, viii, 384; in body tissues, 354; in earth's crust, iii, 308, viii, 19, 129, 192, 195, 196; in light metal group, 17, 127; plant needs of, viii, 337, 341, 344; specific gravity, 384; test for, 287, 289 Calcium Carbide, viii, 153; acetylene prepared from, 231; in nitrogen fixation, 74, i, 36; production and uses, vii, 312, xvi, 191 Calcium Carbonate, viii, 151-2; composition, 117; deposits of, 195; lime from, 149, 150; in soil sweetening, 150, 347; in water, 40, 151, 322. (See also Limestone) Calcium Chloride, viii, 152-3, 322-3; mixture with snow, iv, 175 Calcium Group, viii, 148-53; spectra, 302 Calcium Hydroxide, viii, 150, 347 Calcium Light, compared with sun's, ii, 169 Calcium Oxide, viii, 149-51. (See Lime) Calcium Pentasulphide, viii, 333 Calcium Phosphate, viii, 89, 153, 279-80, 354 Calcium Stearate, viii, 143, 323 Calcium Sulphate, viii, 117, 149, 153; in water, 40, 322-3 Calcium Sulphite, viii, 153, 372 Calcium Tungstate, color in X-rays, iv, 378 Calc Spar, iii, 325 Calculations, mathematical, development of, xv, 181-4, xvi, 61 Caldwell, Kansas, region, iii, 34 Calendar, Babylonian, xvi, 57-8; Bacon's work, 101; clothing in relation to, x, 309; Egyptian, xvi, 70; reforms of Cæsar, 98 Calibration, vii, 158, 363; of condensers, 293-4 California, aerial fish patrol, i, 48; Big Trees (see Big Trees); borax deposits, viii, 89-90; climate, xiv, 348-9, 358; climatic changes in, 361, 362; cretaceous deposits, iii, 216; crustal movements in southern, 81-2, 225; earthquakes and volcanoes, xiv, 331; forests and trees, 374; geese of, xii, 258; gold production, iii, 226, 365, 367; hot springs, xiv, 143; live oaks of, 370; lemon trees of, xv, 22; mercury production, iii, 370; ocean waves used for power, v, 174; oil fields, iii, 350; rainfall, i, 112; raisin-drying industry, v, 257; record temperature, 209; redwood forests, fog drip, 351; "road-runners" of, xii, 265; sea elephant of, 335; sea lions, 334; southern, xiv, 42; "Sunshine State," 86; tin production, iii, 368; valley of, xiv, 215 Callao, harbor of, xiv, 265 Callina of Spain, i, 96, 368 Calms of Cancer and Capricorn, i, 129, 368 Calomel, viii, 170 Caloric, iv, 47, 154, xvi, 125