xiv Contents. 



CHAPTEE XXVIII. 



PAGE 



Newer Pliocene Epoch (continued} Bone-caves and Traces of 

 Man Migration of Terrestrial Animals into Britain across 

 the Drift Plains Subsequent Separation of Britain from the 

 Continent Denudation of the Coasts of Britain . . 456 



CHAPTEE XXIX. 



British Climates and their Causes Eainfall in different areas 

 Areas of Eiver Drainage . .... *: ,. . . 490 



CHAPTEE XXX. 



Origin of Eiver- valleys Their Eelationto Tablelands Escarp- 

 ments cut through by Eivers Geological Dates of different 

 Eiver-valleys The Severn, the Avon, the Thames, the 

 Frome, and the Solent Tributaries of the Wash and the 

 Humber The Eden and the Western-flowing Eivers Scot- 

 land . 496 



CHAPTEE XXXI. 



Eelation of Eiver-valleys and Gravels to the Glacial Drifts 

 Eiver-terraces Bones of Extinct Mammals and Human 

 Eemains found in them Eaised Beaches, &c. . . 530 



CHAPTEE XXXII. 



Qualities of Eiver-waters Dissolving of Limestone Eocks by 

 Solution . . 552 



CHAPTEE XXXIII. 

 Soils 563 



CHAPTEE XXXIV. 



Eelation of the different Eaces of Men in Britain to the Geology 

 of the Country 579 



