Glacier, the source of the Rhone, 7; fed by mountain-snow, 7, 21; melted by the sun's dark rays, 13; terminal moraines of, 38; questions regarding motions of, 54-58; action of the ends of, 58; motion at top and bottom of, 80, 81; lateral compression of, 81, 82; longitudinal compression of, 84, 85; slow movement in winter of, 87; motion of Grindelwald, 94; motion of Great Aletsch, 94; motion of Morteratsch, 95; crevasses at the side of, 106; action, 146, 147; ice, 155; veined or ribboned structure of, 178; blue veins of, 170; tables, 113, 114; mills, 116-118; theory of Scheuchzer regarding, 155; ancient, 145-147; impurities thrust out by, 144; whiteness of a clean, 43, 170; measurements by Hugi and Agassiz of, 59, 60; epoch, 152-167. Glacier des Bois, description of, 38-43. ---- des Bossons, 56; mass of ice upon, 134. ---- of Aletsch, sand-cones of, 116. ---- des Périades, 51. ---- du Talèfre, boundary of, 53; width of, 92; chasms of the, 98. ---- de Léchaud, motion of, 80; width of, 82; compression of, 190. ---- du Géant, _névé_ of the, 49; motion of, 79; width of, 82; cracks above the ice-falls of, 119; honey-combing of, 115; shortening of, 190. ---- Unteraar, movement of, 61; appearance of Prof. Forbes on, 161; measurements by Agassiz on, 162. ---- Görner, sand-cones of, 116; description of, 140-144; moraines of, 143; advance and retreat of, 144; objects of interest on, 144; structure and bedding on, 181. Grand Plateau, crevasse on, 57, 118. Greenland's icy mountains, 21. Growth of knowledge, 59. Guesses in science, 74. H Harmony of life and its conditions, 125. Heat, waves of, 12; invisible, 14; office of the invisible waves of, 36; absorption of solar, 100; demanded for the liquefaction of ice, 131; latent, 153. Hoar-frost, 5, 6; not melted by light-waves, 13, 18. Hôtel des Neuchâtelois, movements of, at Riffelberg, 141. I Ice, structure of, 35, 36, 119; towers of, 104; sea, 132-134; retreat of, 145; development in the Alps of, 150; freezing of pieces of, 164; liquefaction by pressure of, 108, 160; translucent, 177; difference between hard and soft, 87. Icebergs, of arctic seas, 133; described by Sir Leopold McClintock, 133, 134; drifting of, 134; origin of, 134; of Switzerland, 136-138; colors of, 138; formation of chains of, 165. Ice-lens, concentration of sun's rays by means of, 37. Ice-river through the vale of Hasli, 146. Icicles, 99; how produced, 100; a theory of, 100-102 Imagination, scientific use of, 34. Impurities thrust out by glaciers, 144. Infinite Wisdom, designs of, 124. J Jardin, description of, 53. Jungfrau, 136, 137. K Killarney, luxuriant vegetation of, 27, 151. L