Geological Structure of the Island of Moen. Great Disturbances of the Chalk posterior in Date to the Glacial Drift, with Recent Shells. M. Puggaard's Sections of the Cliffs of Moen. Flexures and Faults common to the Chalk and Glacial Drift. Different Direction of the Lines of successive Movement, Fracture, and Flexure. Undisturbed Condition of the Rocks in the adjoining Danish Islands. Unequal Movements of Upheaval in Finmark. Earthquake of New Zealand in 1855. Predominance in all Ages of uniform Continental Movements over those by which the Rocks are locally convulsed. CHAP. 18. THE GLACIAL PERIOD IN NORTH AMERICA. Post-glacial Strata containing Remains of Mastodon giganteus in North America. Scarcity of Marine Shells in Glacial Drift of Canada and the United States. Greater southern Extension of Ice-action in North America than in Europe. Trains of Erratic Blocks of vast Size in Berkshire, Massachusetts. Description of their Linear Arrangement and Points of Departure. Their Transportation referred to Floating and Coast Ice. General Remarks on the Causes of former Changes of Climate at successive geological Epochs. Supposed Effects of the Diversion of the Gulf Stream in a Northerly instead of North-Easterly Direction. Development of extreme Cold on the opposite Sides of the Atlantic in the Glacial period not strictly simultaneous. Effect of Marine Currents on Climate. Pleistocene Submergence of the Sahara. CHAP. 19. RECAPITULATION OF GEOLOGICAL PROOFS OF MAN'S ANTIQUITY. Recapitulation of Results arrived at in the earlier Chapters. Ages of Stone and Bronze. Danish Peat and Kitchen-Middens. Swiss Lake-Dwellings. Local Changes in Vegetation and in the wild and domesticated Animals and in Physical Geography coeval with the Age of Bronze and the later Stone Period. Estimates of the positive Date of some Deposits of the later Stone Period. Ancient Division of the Age of Stone of St. Acheul and Aurignac. Migrations of Man in that Period from the Continent to England in Post-Glacial Times. Slow Rate of Progress in barbarous Ages. Doctrine of the superior Intelligence and Endowments of the original Stock of Mankind considered. Opinions of the Greeks and Romans, and their Coincidence with those of the Modern Progressionist. CHAP. 20. THEORIES OF PROGRESSION AND TRANSMUTATION.