CONTENTS 



PART I.— DISPERSAL: 



A Study of the Phenomenon of Avian Emioration 

 TO THE British Archipelago and adjoining Areas. 



CHAPTER I. 



PAST geographical MUTATIONS AND CLIMATIC CHANGES. 



I'AGE 



British Fossil Birds — Definition of the present Work — The 

 British Area — West European Submarine Plateau — The 

 British Seas — Ancient Land Areas between Greenland and 

 Europe — Effects of Submergence — The Great Submer- 

 gence of the British Islands — Evidence against it — Physical 

 Changes during the last Glacial Period — Geography of 

 Western Europe during late Pliocene, Pleistocene, and 

 early Post-Glacial Time — Commingling of Pliocene and 

 Pleistocene Species — Glaciation correlated with Elevation 

 and Subsidence — Changes in the Earth's Centre of Gravity 

 — Coast-Line of British Area at the Close of the Glacial 

 Epoch — Geographical and Climatal Conditions — The 50- 

 Fathom Contour — The 40-Fathom Contour — The 20- 

 Fathom Contour — The 15-Fathom Contour — Commingling 

 of Southern and Temperate Species — Absence of Large 

 Southern Mammals from European Post-Glacial Deposits 

 — The Flora and Fauna of Greenland and Iceland — Post- 

 Glacial Changes of Climate — Effects of Physical and 

 Climatic Change on Birds ... ... ... x 



