LIST OF ILLUSTRATIONS. vii. 



The Great Auk. {From a Drawing by MacGillivray pacxE 

 in the British Museum) . . . . . . . . 171 



A Reduced Facsimile of MacGillivray 's Handwriting . . 172 



Nest of Greenfinch to show its Dirty Condition after 

 the Fledging of the Young. {PJiotographed by 

 C. K. Siddall) ' . . . . 185 



Young Gull in Fhght. Pigeon Alighting. {Photo- 

 graphed by F. W. Headley) 192 



Barn-Owi in Flight. {Photographed by CUnton G. 



Abbott) .' 261 



Musceum Tradescantianum. (Facsimile of Title Page) 267 



John Tradescant, the Elder. {After the Engraving 



by W. Hollar) ^ . . 270 



John Tradescant, the Younger. {After the Engravin/ 



by W. Hollar) 271 



A Young Kestrel. {Photographed by A. Geoffrey 

 Leigh) : — 



Twenty-seven days old . . . . . . . . 299 



Thirty-three days old 300 



Forty-seven days old . . . . . . . . 301 



Two Nests built side by side by one Pair of Hedge- 



Sparrows. {Photographed by C. W. Colthrup) . . 308 



Zone-marked Egg of Black-headed Gull. {Photo- 

 graphed by H. Bentham) . . . . . . . . 317 



The First and Second Generations of Nestling Down 



in the Barn-Owl. {Draivn by W. F. Pycrsii) .. 324 



