Rain, its source, 3; tropical, 23, 25. Rainfall, observations on amount of, 28. Regulation, theory, 163-167; observations made by Mr. Faraday, 164; formation of chain of icebergs by, 165; cause of, 167; Faraday's view of, 171-176. Relation of structure to pressure, 183; veined structure described by Guyot, 183-185; illustration, 186; connection established, 187. Retina, how excited, 8; theory of Sir Isaac Newton, 9. Riffelberg Hotel, location of, 144. Rivers, their sources, 1, 7, 19. S Sand-cones, 116. Scientific tacts, connection of, 72. Siedelhorn, view from the summit of, 146. Snow, its conversion into ice, 156; consolidation in Alpine regions, 156; line, 49; its formation in Russian ball-rooms, 5; in subterranean stables, 5, 14; in polar regions, 21; its architecture, 29-32, 34, 91; absorbs solar heat, 100. Solidifying power of camphor and metals, 17. Source of the Severn, 2; the Thames, 2; the Danube, 2; the Rhine, 2; the Rhone, 2; the Gauges, 2; the Euphrates, 2; the Garonne, 2; the Elbe, 2; the Missouri, 2; the Amazon, 2; Albula, 2; the Arveiron, 38; the Aar, 50. Stalactites of Alpine crevasses, 100. Steam, its condensation, 3, 4. Sunbeams, office of, 10-21. Sun, its heat the source of Alpine ice, 7; vibratory motion of the atoms of the, 11; position of, 19; indirect heat, of the, 28. Switzerland, ancient glaciers of, 145-147. T Theodolite, description of, 63; use of, 64, 65. Theory, of Dilatation, 155; developed by De Charpentier, 156; sliding, 156; plastic, 156-160; viscous, 161-103; regulation, 163-167; of glacial epoch, 155-167. Trade-winds, 20. Transverse crevasses, formation of, 104, 105. Trélaporte, promontory of, 44; motion of the water through the narrows of, 79. U Universe, order of the, 32. V Valley, of Hasli, 146, 147; Black, 151. Vapor, in the atmosphere, 5. Viscous theory, advocated by Prof. Forbes, 161; rejected by M. Agassiz, 162. W Water, changes of volume of, 118-122; maximum density of, 120; effects of expansion of, 121; not a solitary exception to general law, 124; molecular expansion of, 125-127; temperature necessary to freeze the sea, 132; special solidifying power of, 173; freezing-point of, 168. Waves, of light, 8-11, 127; length of, 12; of heat, 12. Whiteness of a clean glacier, 43, 176; of Märgelin See, 138, 176; of snow, 176; of ice formed in freezing mixtures, 177. THE END. * * * * * Transcriber Note On page 61 (153), Principal was changed to Professor. Minor typos were corrected. Some images were moved to avoid splitting paragraphs. End of the Project Gutenberg EBook of The Forms of Water in Clouds and Rivers, Ice and Glaciers, by John Tyndall