CONTENTS. xxiii 



I'AGE 



' 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 



