CONTENTS. xxiii 



'Principles of Geology' published in 1830— Louis Agassiz: his 

 early life — De Saussure's Study of Glaciers— Agassiz on Europe 

 and North America being once covered with Ice — Boucher de 

 Perthes on Ancient Flint Implements— McEnery on Flint Im- 

 plements in Kent's Cavern, with Bones of Extinct Animals — 

 Swiss Lake-dwellings — « Antiquity of Man * .... 404 



CHAPTER XL. 



SCIENCE OF THE NINETEENTH CENTURY (CONTINUED). 



Facts which led Naturalists to believe that the different kinds of 

 Animals are descended from Common Ancestors — All Animals of 

 each class formed on one Plan — Embryological Structure — 

 Living and Fossil Animals of a country resemble each other — 

 Gradual Succession of Animals on the Globe — Links between 

 different species — Darwin's Theory of Natural Selection- 

 Wallace worked out the same Theory independently — Sketch of 

 the Theory of Natural Selection — Selection of Animals by Man — 

 Selection by Natural Causes — Difficulties in Natural History 

 which are explained by this Theory — Foolish Prejudices against 

 it — Concluding Remarks on the History of Science . . . 4^9 



