Transcriber Note Text emphasis denoted by =Bold= and _Italics_. +---------------------------------------------------------+ | UNITED STATES | | DEPARTMENT OF AGRICULTURE | | | | CIRCULAR No. 363 | | | +---------------------------------------------------------+ | Washington, D. C. October 1935 | +---------------------------------------------------------+ | | | | | THE MIGRATION | | OF NORTH AMERICAN BIRDS | | | | | | By | | FREDERICK C. LINCOLN | | | | Senior Biologist in Charge, Section of Distribution | | and Migration of Birds Division of Wildlife Research, | | Bureau of Biological Survey | | | | | | [Illustration] | | | | | +---------------------------------------------------------+ For sale by the Superintendent of Documents. Washington, D. C. -- Price 10 cents CIRCULAR No. 363 OCTOBER 1935 UNITED STATES DEPARTMENT OF AGRICULTURE WASHINGTON, D.C. THE MIGRATION OF NORTH AMERICAN BIRDS[1] By Frederick C. Lincoln, _senior biologist, in charge Section of Distribution and Migration of Birds, Division of Wildlife Research, Bureau of Biological Survey_ [Footnote 1: This circular supersedes Department Bulletin 185, Bird Migration, by Wells W. Cooke, published in 1915. In addition to his own original investigations in the field and those reflected in the files of the Biological Survey, the author has made free use of the writings of Professor Cooke, Alexander Wetmore, William Rowan, A. Landsborough Thomson, H. A. Allard, and others. To all these grateful acknowledgment is made, particularly to Doctor Wetmore, Assistant Secretary of the Smithsonian Institution, who has read the entire manuscript and made many valuable comments and suggestions.] CONTENTS