Glacier loaded along its edges by the ruins of the mountains; Lateral Moraines; Medial Moraines; their number _one_ less than the number of Tributaries; Moraines of the Mer de Glace; successive shrinkings; Glacier Tables explained; 'Dip' of stones upon the glacier enables us to draw the Meridian Line; type 'Table;' Sand Cones; moraines engulfed and disgorged; transparency of ice under the moraines 9.--Glacier Motion,--Preliminary. 269 Neve and Glacier; First Measurements; Hugi and Agassiz; Escher's defeat on the Aletsch; Piles fixed across the Aar glacier by Agassiz in 1841; Professor Forbes invited by M. Agassiz; Forbes's first observations on the Mer de Glace in 1842; motion of Agassiz's piles measured by M. Wild; Centre of the glacier moves quickest; State of the Question 10.--Motion of the Mer de Glace. 275 The Theodolite; mode of measurement; first line; Centre Point not the quickest; second line; former result confirmed; Law of Motion sought; the glacier moves through a Sinuous Valley; effect of Flexure; Western half of glacier moves quickest; Point of Maximum Motion crosses axis; Eastern half moves quickest; Locus of Point of Maximum Motion; New Law; Motion of the Geant; motion of the Lechaud; Squeezing of the Tributaries through the Neck of the valley at Trelaporte; the Lechaud a Driblet 11.--Ice Wall at the Tacul,--Velocities of Top and Bottom. 289 First attempt by Mr. Hirst; second attempt, stakes fixed at Top, Bottom, and Centre; dense fog; the stakes lost; process repeated; Velocities determined 12.--Winter Motion of the Mer de Glace. 294 First line, Above the Montanvert; second line, Below the Montanvert; Ratio of winter to summer motion 13.--Cause of Glacier Motion,--De Saussure's Theory. 296 First attempt at a Theory by Scheuchzer in 1705; Charpentier's theory, or the Theory of Dilatation; Agassiz's theory; Altmann and Gruener; theory of De Saussure, or the Sliding Theory; in part true; strained interpretation of this theory 14.--Rendu's Theory. 299 Character of Rendu; his Essay entitled 'Theorie des Glaciers de la Savoie;' extracts from the essay; he ascribes "circulation" to natural forces; classifies glaciers; assigns the cause of the conversion of snow into ice; notices Veined Structure; "time and affinity;" notices Regelation; diminution of _glaciers reservoirs_; Remarkable Passage; announces Swifter Motion of Centre; North British Review; Discrepancies explained by Rendu; Liquid Motion ascribed to glacier; all the phenomena of a River reproduced upon the Mer de Glace; Ratio of Side and Central velocities; Errors removed