INDEX. 



Accurate measurements of the motions 

 of glaciers, by Agassiz and Forbes, 

 60-62. 



iEggischhorn, view from the, 137. 



Agassiz's measurements T 60; conclu- 

 sions, 107; discovery by, 150; obser- 

 vations made by, 187. 



Aiguille du Dru. pyramid of, 43; cloud- 

 banner of, 90. 



des Charrnoz, 43; clouds about, 90. 



Noire, 51. 



Verte, height of, 53. 



du Midi, stone avalanches of, 56. 



Air, its expansion, 24; a chilling pro- 

 cess, 25; experiments illustrating, 

 25, 26. 



Aletech 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, 149. 



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 trans- 

 parency, 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, 



Bowlders, size of, 148, 149. 



Changes of volume resulting from heat 

 and cold, 118-122; illustrations of, 

 119, 120; consequences from, 122; 

 opinions of Count Rumford, 123, 124. 



Chapeau, refreshment at, 41. 



Cleavage and glacier lamination, 187; 

 analogy between, 188, 189; planes 

 of, 188; observation of Prof. Sedg- 

 wick, 188 ; discovery by Daniel Sharp, 

 188; additional evidence of Mr. Sor- 

 by, 189 ; association of pressure and 

 cleavage established, 189; relation 

 of cause and effect, 189; artificial 

 conditions of Nature combined, 189, 

 190. 



Clouds, their formation, 3-6; in tropical 

 regions, 25 ; illustration of the forma- 

 tion of, 26. 



Col du Geant, snows and ice-cascade of 

 the, 46, 47; snow fall on the plateau 

 of, 48, 49 ; cracks on, 179. 



Conclusion, 191, 192. 



Condensers needed, 154. 



Conditions necessary for the production 

 of natural phenomena, 99. 



Conscience, scientific, 180. 



Crevasses, 41 ; work among the, 52; wid- 

 ening of, 54; drifting of bodies buried 

 in, 57; birth of, 98; features of, 100; 

 characteristic, 102; transverse, 103; 

 stalactites of Alpine, 100 ; marginal, 

 105-107: longitudinal. 109; curva- 

 ture of glacier related to number of, 

 110-112. 



Crystallization of metals, 29; of sus-ar, 

 30; of saltpetre. 30; of alum, 30; of 

 chalk, 30; of carbon, 30; reversal of 

 the process of, 36. 



De Saussure's theory of glacier-motion, 

 156. 



