Growth, age in relation to, ix, 47-8, 288-9; by cell division, 43-8; chemical regulation of, 169-70; food requirements for, 31-4, 286-8, 295; life and, xii, 13; metabolism of, ix, 38-9, 295; of bones, 56, 58; of skin, 312; of various tissues, 47-8, 286-7; of skull, xv, 40; rate of, in man, ix, 32 (diagram); vitamines necessary to, x, 261, 262 Gruener, Prof. H., author CHEMISTRY, Vol. viii Guam, ocean depths near, iii, 51 Guango Tree, i, 350 Guatemala, Santa Maria eruption, xiv, 328-9 Guava, xiii, 196, 225 Guayaquil, sanitary measures, i, 327; yellow fever campaign, x, 173 Guericke, Otto von, iv, 29, 116, xvi, 110 Guillemots, xii, 264-5 Guinea Pigs, xii, 289; anaphylaxis in, x, 213 Gulf Coastal Plain, xiv, 214; chalk deposits, iii, 266; Cretaceous deposits, 216; geological history, 222, 231 Gulf Stream, climatic influences of, viii, 37, xiv, 304; meeting with Labrador current, 305; origin and course, 304; "paper sailors" of, xii, 78; plan for protecting, i, 345; Portuguese man-of-war in, xii, 37; seed dispersal by, xiii, 346 Gull, Sir William, xvi, 180, 184 Gulls, xii, 264 Gum Arabic, source, xiii, 226 Gumboils, ix, 56, 187 Gums, composition of, viii, 223, 229; electrical conductivity, iv, 259 Gums (mouth), chilling of, by ether, iv, 174; germ infection through, x, 202, 219, 222 Guncotton, composition and action, viii, 63, 255, 261; discovery, xvi, 163 Gunite, v, 136 Gunnison River, Colorado, xiv, 172-3, 175 Gunny Sacks, xiii, 241 Gunpowder, viii, 144-5; explosion, v, 156-7, viii, 62, 145; introduction, v, 361, 368, xvi, 101 Guns (big), v, 368-71; locating of, by sound velocity, i, 313, iv, 201-2; making of, v, 323-5; operation on battleships, v, 104, vii, 333-4; phenomena in World War, i, 193-4 (see also Artillery, Projectiles) Guns (small), development of, v, 361-2, xv, 213, 216-19; kick, v, 143; kick utilized in Maxim gun, 363; machine, 362-8; percussion lock invention, 377; standardization in manufacture, 49-50 Gunshot Remedies, vii, 241, x, 76 Gunter, Edmund, xvi, 104 Gushers, oil, iii, 353-4 Gusts, i, 295, 373 Gutenberg, Johann, v, 300; printing invention, xv, 179 Guttation, of plants, i, 350-1 Guyon, Felix, xvi, 184 Gymnarchus Fish, xii, 154 Gymnastic Exercises, x, 304-5 Gymnosperms, xiii, 174, 175, 178; alteration of generations, xvi, 166; first appearance, iii, 252, 255 (see also Conifers) Gynecology, development of, x, 80-1, 122, xvi, 180 Gypsum, iii, 331-2, 375-6; composition, viii, 153; deposits and use, xiv, 209; in sea water, 295 Gyro-compass, iv, 254-5, v, 201, 340, 384 Gyroscope, iv, 254-5, v, 335-44, 384; in torpedoes, 373 Gyroscopic Action, of bullets and shells, v, 362 Haber Process, i, 36-7, viii, 74, 105, xvi, 165