INDEX. 



277 



Milward, Mr., quoted, 210, 212; on the 

 wrinkles of mud-slides, 214 ; of glaciers, 

 261 ; notice respecting him, 214, note. 



Models, plastic, xxviii, 47, 58, 77, etc. 



Molecular attachment of granules of ice or 

 snow under pressure, 201. 



Moraine, 239 ; medial, 243. 



Moraine, ancient extension on the left bank 

 of the Mer de Glace, 42 ; moraines of 

 lava streams, 48 ; of Glacier du Miage. 

 198 ; of Glacier of Nant Blanc, 203 ; of 

 the Glacier of the Rhone, 203. 



Motion of glaciers, 11, 15 ; by day and by 

 night, 11 ; theories of the, 15 ; faster at 

 centre than at sides, 12, 35, etc.; faster 

 at top than bottom, 24, 54, 172, 186 ; in 

 winter, 25, 36, 73, 129, etc., 179, 224 ; mo- 

 tion of glacier of the second order, 67, 74, 

 119 ; of the glacier of the Aar, 69, 206. 



Motion of Glaciers, effects of season on, 73, 

 129, 208, 222, etc. ; dependence on weather, 

 132 ; on temperature, 138 ; does not simul- 

 taneously increase and decrease at dif- 

 ferent points of the same glacier, 135, 139, 

 and note ; motion equable, 148 ; argument 

 thence derived in favour of plasticity, 

 148 ; causes affecting its amount, 155-7. 



Motion of glaciers, facts of, recapitulated, 

 250. 



Moulins, permanence of their position, 29, 

 37. 



Mousson, M., quoted, 252, 255. 



Mud-slides, analogies to glaciers, 210 ; that 

 at Malta described by Mr. Milward, 210. 



Nant Blanc, Glacier du, 196 ; its structure 

 and velocity, 197 ; its moraines, 203. 



Naysmith, Mr. J., quoted, 218, note. 



Neve defined, 244 ; on the mode of its con- 

 version into ice, 53, 163, 199 ; stratification 

 of, 199. 



Norway, glaciers of, 237. 



Optical contact of icy particles induced by 



pressure, 201. 

 Oscillations of Glacier of La Brenva, 177, etc. 



P, station so marked on the Mer de Glace, 

 124, 189. 



Pass, undescribed, across the chain of Mont 

 Blanc, 226. 



Parameter, 19. 



Pasterzen Glacier, 240. 



Permanence of the u moulins " and other 

 accidents on the glacier surface, 29, 37. 



Person, M., on the fusion of ice, xxiii, 225- 

 229. 



Pitch, a brittle yet plastic substance, 93, 

 141, 215. 



Plastic or viscous theory stated and sup- 

 ported, 23, 31, 35, 44, 51, 62 ; summary 

 of evidence for it, 140, etc. ; plastic theory 

 recapitulated, 253. 



Plasticity, a quality which admits of grada- 

 tion, 53, 161, etc. ; experiments on the 

 motion of plastic bodies, 47, 58, 77 ; plasti- 

 city of the ice of glaciers, 35, 62, 64, 147 ; 



experiments on the great scale in 1844, 74, 

 103, etc.; desirable to be repeated, 118; 

 plasticity deduced from equability of the 

 motion, 148; from the collapse of the cre- 

 vasses, 154 ; general arguments for, 159 ; 

 plasticity of ice exemplified on a small 

 scale, 161, note, 167 ; increased at a thaw- 

 ing temperature, 166, and note ; illustrated 

 by the local movements of the ice of the 

 Glacier of La Brenva, 184, 185 ; confirmed 

 by the retardation of the lower surface of 

 a glacier, 187 ; illustrated by mud-slides, 

 210 ; by land slips, 211 ; by metal-turn- 

 ing, 219. 



Plasticity of ice near 32 due to the gradual 

 absorption of latent heat, 225, 230. 



Plasticity of ice, some objections to it con- 

 sidered, 254. 



Q, station on the Mer de Glace so marked, 

 106, 190. 



R, station on the Mer de Glace so marked, 

 190. 



Ramond quoted, 98. 



" Regelation," fact so called, 228 ; accounted 

 for by the progressive evolution of latent 

 heat, 231. 



Rendu, Bishop, quoted, 62, 84, 160, 201. 



Restoration of level of a glacier effected 

 during winter. See Level. 



Rhone, observations on the, at Sierre, 185. 



Rhone, Glacier of the, compared to " a pail- 

 ful of mortar poured out," 6; lines of 

 structure on, 7 ; appearance of blocks on 

 the, 203. 



Ribboned structure. See Veined Structure. 



Ridges of ice oblique to the axis of the 

 glacier near the " Angle," 205. 



Rigidity, a relative term, 23, 35, 160, etc. 



Ripples in moving water, 58, 80, 185. 



Saussure. See De Saussure. 



Schlagintweit, MM., quoted, xv, 237. 



Schonhorn, Glacier of the, 75, 120. 



Scoresby, Dr., quoted, 238. 



Scrope, Mr., quoted, 85. 



Seasons, effect of, on glaciers, 27, 36, 73, 



129, etc., 224; on the Glacier of the Aar, 



208. 

 Second order, motion of glaciers of the, 119, 



244. See Glaciers. 

 Semifluid. See Fluid Motion. 

 Serac, a word used by De Saussure, 146, 



note. 



Slags, veined structure in, 82. 

 Slaty cleavage of rocks compared to veined 



structure in glacier ice, 8. 

 Snow line, 243 ; on glaciers, 244. 

 Softening of ice while thawing. See fee. 

 Sound of a glacier in motion, 66. 

 Starke, Mrs., quoted, 50. 

 Structure in the ice of glaciers. See Veined 



Structure. 



Studer, M., quoted, 99. 

 Subsidence of a glacier distinguished from 



ablation, 170. See Depression. 



