IV CONTENTS. 



1. [ndividnal Variation ........ 187 



Individual Variation in general Size and in the relative Size 



of different Parts 197 



Variations in the Size and Form of the Bill, Wing, etc. re- 

 sulting from Age 226 



General Remarks on Individual Variation . . . 228 



Climatic Variation 229 



Species, Varieties, and Geographical Races . . . 243 



IV. List of the Winter Birds of East Florida, with Annotations . . 250 



The Origin of the Domestic Turkey ...... 343 



V. On the Geographical Distribution of the Birds of Eastern North 

 America, with special Reference to the Numbcrand Circumscription 

 of the Ornithological Faunae . ....... 375 



1. Introductory Remarks ........ 375 



2. The Natural Provinces of the North American Temperate 



Ecu ion . 384 



3. The Ornithological Faunre of the Eastern Province of the 



North American Temperate Region ..... 3S7 



The Faunas of the Eastern province considered in Reference 



to the Distribution of Mammals and Reptiles . . . 404 



4. The Ornithological Districts of the North American Temperate 



Region 406 



5. On the Ornithological Range of the Species . . . 407 



General Remarks on the Distribution and Migration of the 

 Birds of the Eastern Province ...... 418 



Appendix to Part V. List of Authorities . . . 426 



No. 4. — Directions for Dredging. Drawn up by L. F. de Pourtales, 

 Assist. E T . S. Coast Survey ........ 451 



No 5. — Appendix to the Preliminary Report (Bulletin No. 9, Vol. I) on 

 the Echini collected by L. F. de Pourtales. By Alexander Agassiz 455 



