U. S. DEPARTMENT OF AGRICULTURE. 



DIVISION OF BIOLOGICAL SURVEY— BULLETIN No. 18. 



C. HART MERRIAM, Chief. 



DISTRIBUTION AND MIGRATION 



OF 



NORTH AMERICAN WARBLERS. 



BY 



A^EiLLs ^w. cooke:, 



ASSISTANT, BIOLOGICAL SURVEY. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1904. 



