THE NEW WORK ON BIRDS. 
KEY 
TO 
CONTAINING A CONCISE ACCOUNT OF EVERY SPECIES OF LIVING AND 
FOSSIL BIRD AT PRESENT KNOWN FROM THE CONTINENT 
NORTH OF THE MEXICAN AND UNITED STATES 
BOUNDARY, INCLUSIVE OF GREENLAND. 
Second Edition, Revised to date and entirely Rewritten, 
WITH WHICH ARE INCORPORATED 
GENERAL ORNITHOLOGY: 
AN OUTLINE OF THE STRUCTURE AND CLASSIFICATION OF BIRDS; 
AND 
FIELD ORNITHOLOGY : 
A MANUAL OF COLLECTING, PREPARING, AND PRESERVING BIRDS. 
BY ELLIOTT COUES, M.A, M.D., PH.D., 
MEMBER OF THE NATIONAL ACADEMY OF SCIENCES, ETC., ETC. 
PROFUSELY ILLUSTRATED. 
T HE original edition of the “Key” being entirely out of print, the undersigned 
have the pleasure of announcing a new edition of this standard work, in- 
dispensable to every student of Ornithology. By use of a smaller type, without 
greatly increasing the size of the volume, it will contain more than twice as 
much matter as “FIELD ORNITHOLOGY” and the “KEY” together, includ- 
ing an entirely new treatise on the 
ANATOMY AND CLASSIFICATION OF BIRDS. 
This standard text-book will be PROFUSELY ILLUSTRATED with several 
hundred wood-cuts, additional and greatly superior to those of the old “Key.” 
Copy is all in the printer’s hands and the composition is far advanced. 
Complete in one volume. 
Address, 
ESTES & LAURIAT, 
BOSTON. 
MASS. 
