Greek Medicine, x, 16-25, xvi, 95-6; preservation and revival of, x, 31, 36, 43-4, 45 Greek Philosophers, remarks on, ii, 27, 30; on origin of earth, 366-7 Greeks (Ancient), boiling of foods unknown to, xv, 233; degeneration of stock, xvi, 96; gods of, xv, 343, 352; idea of insanity, x, 356, 357; idea of soul, xv, 330; in Mediterranean group, xvi, 49; intellectual height, 50; knowledge of loadstone, vi, 28, 29; monsoons used in navigation, i, 130; oar-propelled ships, xiv, 265; plants known to, xiii, 215, 216, 253; sacrifices of, xv, 347-8; scientific bent, xvi, 54; superstitions of, xv, 355; surveying inventions, xvi, 68-9; trade and colonies of, xiv, 307 Greeks (modern), in Alpine group, xvi, 49 Greek Science, xvi, 75, 76-96; debt to Egypt, 75; influence on Copernicus, 102; Roman development of, 99; spread and continuation of, x, 23, 25 Greek Sculpture, xv, 302 Greek Vases, xv, 251, 253 (fig.) Green, complementary color of, iv, 367; effect on blood pressure, xi, 63; in interior decoration, vi, 274; primary color, iv, 366; seeing of, in color-blindness, ix, 116 Green Flash, i, 170-1, 373 Greenhouses, effects of glass on heat, i, 59, iv, 183; electric lighting, xiii, 76 Greenland, climate, xiv, 345; discovery, 261; fjord coasts, 258, 259; foxes of, xii, 344; glaciers of, xiv, 55; ice sheets, iii, 61-2, 237; marriage customs in, xv, 282-3; mirages, i, 173; ocean colors near, xvi, 147; rainlessness, i, 109; winds, 128, 129 Greenland Ranch, Cal., i, 209 Green Mountains, iii, 188 Green River, Uinta Mts., xiv, 166, 168, 175 Greenwich Observatory, founding of, ii, 83, xvi, 124; publications, 125 Grenville Strata, iii, 165-8 Grew, biologist, xvi, 112, 116, 126 Greylock, Mount, iii, 232 Grief, exhaustion from, xi, 135-6; expression of, by monkeys, xv, 65 Ground Sharks, xii, 143 Grinders, invention, v, 48, 381 Grip, disease, x, 294-5 Grison, xii, 349 Ground Moraines, iii, 67 Ground Pines, iii, 254 Groundsel, seed disposal, xiii, 345 Ground Water, iii, 113-29, xiv, 135-52; how plants absorb, xiii, 91-3; landslips facilitated by, xiv, 233; mineral concentration by, iii, 126, xvi, 173; petrifaction by, iii, 15, 126-7; rivers and, xiv, 157 (see also Soil Water) Ground Wires and Plates, vii, 369 Groups, Chemical, viii, 93, 377; interchange principle, 211; ionization, 121-2; nomenclature, 97; valences of, 94 (see also Radicals) Groups (human), formation of, x, 9, xv, 361-3 Grouse, xii, 261 Growing Season, i, 373