Glands, activity and blood supply, ix, 220-1; adrenalin effects on, 171; control of, 159-69, x, 346-7; ductless, x, 346-53; energy release by, xi, 24; fatigue effects, xi, 272; nerve connections, ix, 159-60; reflex responses by, xi, 23; with ducts, x, 347 Glare, direct and reflected, vi, 277-8 Glasgow, soot-fall, i, 65 Glass, antiquity of, viii, 269, 280-1, xvi, 73-4; coloring of, viii, 282; colors in X-rays, iv, 378; composition and properties, viii, 281, 304-5; effects on light and heat waves, iv, 183; electrification of, 257, 258, 259; ground by sand blast, 130; heat conductivity, 179; light decomposition by, ii, 100-1; light deviations in strained, iv, 330; light refraction by, 327; sodium compounds in, viii, 137, 146 Glasses (lenses), for various eye defects, ix, 111, 112, 113, 114 Glazed Frost, i, 108, 121, 373 Glidden, Carlos, v, 312 Glisson, Francis, x, 86, xvi, 178 Globefishes, xii, 164 Globigerina Ooze, xii, 18 Globular Clusters (Stars), ii, 336-40; Hyades as, 342; studies of, at Mt. Wilson, 159-60 Globular Lightning, i, 149, vii, 205-6, 213-15 Glory (meteorology), i, 184-5, 373 Glowworms, i, 346; Fabre's studies, xvi, 144 Glucinum, atomic weight and symbol, viii, 180, 383; in calcium group, 148 Glucose, viii, 225-6, 377, ix, 230; converted from cellulose, viii, 255; fermentation of, 225, 248; formula, 219, 225, 229; in human body, 359; manufacture and uses, 228, 243-4; production by plants, 335; use of, by body, ix, 230, 243, 244, 245 Glutton (weasel), xii, 348, 349 Glycerine, viii, 215, 247-8; base of fats, 221, 245; boiling point, 299; melting requirements, iv, 162; production in wine-making, x, 138 Glycogen, xi, 136-7, 138; chemistry of, viii, 228-9, 350; production and storage in liver, 359, ix, 291, 292, 297, 298, x, 329; reconversion into sugar, ix, 293 Glyptodon, xii, 283-4 Gnawers, xii, 285-96 Gneiss, iii, 379; formation, 169, xiv, 19; jointing of, 133 Gnomons, ii, 24, 25, 300 Gnus, xii, 327 Goats, xii, 325-6; horns of, 328; usefulness, 324 Gobar, of Nile region, i, 96 God, conceptions of, xv, 344; ideas of, in Old Testament, 374 Goddard Rocket, i, 22-3 Godman, John, x, 116, xvi, 185 Gods, evolution of belief in, xv, 341-4, 347-8, 357 Goethe, evolution known to, x, 136; on cloud forms, i, 98 Goethals, Panama Canal Zone work, x, 162 Goitre, ix, 303; exophthalmic, x, 272, 276-7, 351-2; removal of thyroid gland in, 349