di CONTENTS 



lAGK 



from the Facts — Tabic of Endemic British Species and 

 Races — Rl'sioiic of Present and Preceding Chapters — Im- 

 portance of New Law of Dispersal — Exterminating Effects 

 of Glacial Epoch — Effects of Cold Winters — The Dartford 

 Warbler — Importance of Southern Range Bases ... ... 112 



CHAPTER V. 



RECENT EMIGRATION. 



Increase, the Ruling Impulse of Life — The Ice Age and Emi- 

 gration — ^Emigration still in Progress — Effects of Civiliza- 

 tion on the Emigration of Birds — Present Emigration in 

 the British Area — Emigration of the Missel Thrush- 

 Effects of Severe Winter on that Bird — Emigration of 

 Song Thrush and Blackbird— Of the Redstart— Of the 

 Robin, the Nightingale, the Whitethroat, the Willow Wren, 

 and the Wood Wren — Absence of Wood Wren from Nor- 

 way — Probable Winter Quarters of Individuals Breeding in 

 Sweden — Emigration of Marsh and Sedge Warblers — Of 

 the Goldcrest — Migration Waves of Goldcrests — Emigra- 

 tion of Hedge Accentor, Nuthatch, and Tree Pipit — Of 

 the Greenfinch — Fluctuating Breeding Range of this Species 

 in the British Area — Emigration of Sparrows — Emigration 

 of Tree Sparrow to the Faroes — Emigration of Chaffinch 

 and Bullfinch — Of the Starling, the Jay, the Magpie, and 

 the Rook — Of the Tawny Owl, he Ring Dove, and the Stock 

 Dove — Of the Great Crested Grebe and Woodcock — Table 

 of Species whose Emigrations are still in Progress — Analysis 

 of Table — Northward Tendency of Emigration— Emigration 

 attended by Migration — Extinction of British Species — 

 Effects of Law of Dispersal 168 



CHAPTER \T. 



ISLAND AVIFAUNAS. 



The West PaliEarctic Islands— Continental Islands — Birds of 

 Borneo, Formosa, the Philippines, etc. — Ancient Conti- 

 nental Islands — Birds of the Canaries, Madagascar, Azores, 

 Bermuda, etc. — Reasons for the Lhiequal Dispersion of 

 .Species — Islands and Migration — The British Islands — 

 Endemic British Species — The Red Grouse — Endemic 

 British Races or Representative Forms — The St. Kilda 



