La Grande Jorasse, crests of, 43; roses of cloud about, 90. Lake of Geneva, an expansion of the river Rhone, 6. Latent heat, 153, 167. Lateral moraines, origin of, 54. Light, wave-theory of, 10, 11; inference from the phenomena of, 11; length of wave of, 12. Likeness of glacier-motion to river-motion, 72-76. Liquefaction of ice, 168, 169; experiment by Mr. Bottomley, 170; experiment by Mr. Boussingault, 170, 171. Locus of the point of swiftest motion, 76. Longitudinal crevasses, how formed, 109; examples of, 110. M Magillicuddy's Reeks, 27, 150, 151. Magnet, poles of, 32; repelling corners and ends of, 126. Märgelin See, 138; icebergs in the, 138. Marginal crevasses, explanation of, 106-109. Mauvais Pas, 41. Measurements of glaciers by Hugi and Agassiz, 59, 60. Medial moraines, how accounted for, 55. Mer de Glace, 41; its sources, 43-45; view of the, 44; branching of the, 45; medial moraines of the, 51, 52; triangulation of, 62; motion of, 66, 70; daily motion of, 67; unequal motion of the two sides of, 70-72; motion of axes of, 78; summer condition of, 87; winter on, 88-92; dirt-bands of, 127; dimensions of, 145; winter motion of, 93; greater number of crevasses on eastern side of, 112; glacier tables of, 113; grand moulin of, 117, 118; approximate weight of, 154. Molecules, of water, 31, 34; expansion of, 125; forces acting upon, 127; exclusiveness of water, 132, 133. Montanvert, auberge of the, 41, 43; appearance in winter, 89. Moraine, lateral, 41; medial moraines of the Mer de Glace, 51, 112; cedars of Lebanon growing on ancient, 150; explanation of the cause of ridges on, 112, 113. Morteratsch glacier, cause of the widening of the medial moraine of, 97; motion of, 95, 96; sand-cones of, 116. Motion, of Mer de Glace, 93; of Grindelwald, 94; of Great Aletsch glacier, 94; of Morteratsch glacier, 95; sand-cones of, 116. Moulins, description of, 116; dangers from, 117; sounding of, 118. Mountain condensers, 27, 150. N _Névé_, explanation of term, 49; stratification of the, 179. O Obliquity of the lateral crevasses, 167; illustration, 107, 108. P Petit Plateau, 56. Piz Bernina, route to, 95. Place de la Concorde of Nature, 136. Plastic theory, 156; advocated by Bordier, 157; advocated by Rendu, 158. Poles, atomic, 32, 126; attractive and repellent, 30. Pontresina, village of, 95. Precious stones, examples of crystallizing power, 30. Precipitation, 23, 25; atmospheric, 27. Promontory of Trélaporte, 44; of Tacul, 51. Proofs of glacier-motions, 58. Pyramid of Aiguille du Dru, 43; of Aiguille des Charmoz, 43. Q Quotation from Rendu, 158. R