31.--The Veined Structure and the Liquefaction of Ice by Pressure. 408 Influence of pressure on Melting and Boiling points; some substances swell, others shrink in melting; effects of pressure different on the two classes of bodies; Theoretic Anticipation by Mr. James Thomson; Melting point of Ice lowered by pressure; Internal Liquefaction of a prism of solid ice by pressure; Liquefaction in Layers; application to the Veined Structure 32.--White Ice-Seams of the Glacier du Geant. 413 Aspect of Seams; they sweep across the glacier concentric with Structure; Structure at the base of the Talefre cascade; Crumples; Scaling off by pressure; Origin of seams of White Ice 33. 419 Glacier du Geant in a state of Longitudinal Compression; Measurements which prove that its hinder parts are advancing upon those in front; Shortening of its Undulations; Squeezing of white Ice-seams; development of Veined Structure Summary 422 Appendix 427 Index 441 ILLUSTRATIONS. The Mer de Glace.--Showing the Cleft Station at Trelaporte, the Echelets, the Tacul, the Periades, and the Grand Jorasse. _Frontispiece_