APPENDIX 
A FEW EXCELLENT BOOKS RELATING DIRECTLY OR 
INDIRECTLY TO ORNITHOLOGY 
EVOLUTION 
ORIGIN OF SPECIES. 
Charles Darwin. Appleton & Co., New York. 
From THE GREEKS TO DARWIN. 
Henry Fairfield Osborn. Macmillan Co., New York. 
OrGANIC EVOLUTION. 
M. M. Metcalf. Macmillan Co., New York. 
VARIATION IN ANIMALS AND PLANTS. 
H.M. Vernon. Henry Holt & Co., New York. 
BOOKS FOR THE IDENTIFICATION OF NORTH AMERICAN BIRDS 
GuipE To THE Birps or New ENGLAND AND EasterN New York. 
Ralph Hoffmann. Houghton, Mifflin & Co., Boston. 
Hanpsook or Birps or Eastern Nortu Ammrica. 
F. M. Chapman. Appleton & Co., New York. 
Hanppook or Birps oF THE WESTERN UNITED STAaTEs. 
Florence M. Bailey. Houghton, Mifflin & Co., Boston. 
Key to Norra AMERICAN Birps (2 vols.). 
Elliot Coues. Dana Estes & Co., Boston. 
Brrps or NortH AND MippLe America (3 parts; others to follow). 
Robert Ridgway. Bulletin of the United States National Museum, 
No. 50, Washington, D. C. 
History or Norra American Lanp Birps (3 vols.). 
Baird, Brewer, and Ridgway. Little, Brown & Co., Boston. 
483 
