BIRDS IN FLIGHT 



BY 



W. p. PYGRAFT, F.Z.S. 



Zoological Department, British Museum (Natural History) 



Fellow of the Zoological Society of London 



Hon. Member of the American Ornithologists' Union 



Associate of the Linnean Sodety 



Member of the Marine Biological Association of the United Kingdom 



Member of the Royal Antbropological=Institute 



Author of " A History of Birds " " The Infancy of Animals " 



" The Courtship of Animals" " The Sea-shore" Etc. Etc. Etc. 



Illustrated by 



ROLAND GREEN, F.Z.S. 



LONDON 



GAY & HANGOGK LIMITED 



All Rights Reserved 



