492. Steadfast, prudent, without terror, though not at all times without awe, I have found you on rock and ice, and you have shown the still rarer quality of steadfastness in intellectual effort. As here set forth, our task seems plain enough, but you and I know how often we have had to wrangle resolutely with the facts to bring out their meaning. The work, however, is now done, and you are master of a fragment of that sure and certain knowledge which is founded on the faithful study of nature. Is it not worth the price paid for it? Or rather, was not the paying of the price the healthful, if sometimes hard, exercise of mind and body, upon alp and glacier--a portion of our delight? 493. Here then we part. And should we not meet again, the memory of these days will still unite us. Give me your hand. Good bye. INDEX. A Accurate measurements of the motions of glaciers, by Agassiz and Forbes, 60-62. Æggischhorn, view from the, 137. Agassiz's measurements, 60; conclusions, 107; discovery by, 150; observations made by, 187. Aiguille du Dru, pyramid of, 43; cloud-banner of, 90. ---- des Charmoz, 43; clouds about, 90. ---- Noire, 51. ---- Verte, height of, 53 ---- du Midi, stone avalanches of, 56. Air, its expansion, 24; a chilling process, 25; experiments illustrating, 25, 26. Aletsch glacier, 136; length of, 136; arm of, 137. Alpine ice, origin in the sun's heat, 7. Ancient glaciers of England, Ireland, Scotland, and Wales, 150, 151. Architecture of snow, 29-34, 91; of lake-ice, 35, 169. Arveiron, vault of, 66; description and cause of, 92. B Bel Alp, description of the, 139, 140. Bergschrund, formation of the, 102, 103, 179. Blue veins of glaciers, 176; whiteness of snow, 176; whiteness of ice, 177; freezing of lake-ice, 177; explanation of cause of whiteness of glaciers, 178; translucency converted into transparency, 178; vertical veins, 179; structure and bedding on glaciers, 181, 182; stratification theory, 183; observations, 187. Bodies of guides found on Glacier des Bossons, 57, 144. Boulders, size of, 148, 149. C