312 



INDEX 



Areas of Dispersal, birds do not 

 wander from, 27S 



Aj'gil/oriiis, 4 



Arrival of birds from north and 

 north-east, 261, 262 



Asia, the Flora of the mountains 

 of, 300 



Asiatic and American forms, in- 

 termixture of, 61, 62 



Autumn and Coasting Migrants, 

 analysis of Table of, 152 — 154 



Autumn migration, difficulty of 

 observing, 261 



Autumn migration, duration of, 

 268 



Autumn migration. Table indicat- 

 ing the, 270 — 275 



Autumn, vertical migration in, 269 



Avian life, effects of changed 

 climate on, 52 



Azores, birds of the, 190 



Baltic glacier, the, 63 



Bermudas, birds of, 190 



£e)-nkia leucopsis, 113 



Birds, effects of submergence of 

 North Sea plains on, 132 



Birds, gradual effects of a chang- 

 ing climate on, 211 



Birds migrating too early, 246 



Birds, northern and southern 

 groups of, 303 



Blue-headed Wagtails, emigra- 

 tions of, 99, 100 



Bonin Isles, birds of, 203 



Borneo, birds of, 189 



lios, 34, 57 



Breeding-grounds and winter 

 quarters coalescing, 213 



Breeding ranges, ancient, 213 



lirent Goose, effects of unfavour- 

 able seasons on, 165 



British Archipelago, emigration of 

 birds within, 143 



British Area, abnormal migrants 

 to, 91 



British Area, coast-line of at close 

 of the CJIacial Epoch, 1 5 



British Area, earliest departures 

 from in autumn, 262, 263 



British Area, geographical and 



climatic conditions of, 16 

 British Area, migration into from 



the East, 264 — 266 

 British Area, present emigration 



in, 170 

 British Area, reasons for absence 



of certain species from, 90, 



91 



British Area, routes followed by 

 summer migrants to, 214 



British Area, situation of now 

 unfavourable to emigration, loi 



British Area, species do not breed 

 south of their entry into, 217 



British Area, Table showing the 

 proportional distribution of 

 species over, 154 



British Area, the, 5 



British Area, the 15-Fathom Con- 

 tour of, 1 8 



British Area, the 40-Fathom Con- 

 tour of, 16 



British Area, the 20- Fathom Con- 

 tour of, 1 7 



British Area, West European 

 species absent from, 93 — 95 



British Avifauna, poorness of in 

 endemic species, 197 



British Islands, commencement 

 of autumn migration in, 261 



British Islands, summer visitors 

 to, 79, 80, 81 



British Islands, summer visitors 

 to, winter quarters of in Refuge 

 Area II., 81 



British Islands, Table of autumn 

 migrants to and coasting mi- 

 grants over, 151, 152 



British Islands, Table of species 

 increasing their range in, 179 



British Islands, Table of Summer 

 Migrants to, 148 



British Isles, the, 192 



British Isles, the great submerg- 

 ence of, 7 

 British Isles, winter visitors to 

 that also visit Refuge Area II., 

 77, 78 

 British Seas, the, 5, 6 



