BIRD MIGRATION 



MISSISSIPPI VALLEY, 



W. W. COOKE and OTTO WIDMAN, 



READ BEFORE THE 



RIDGWAT ORNITHOLOGICAL CLUB, 



XOVEMBBR; S? 1 8$?, 



PUBLISHED IX THE "AMERICAN FIELD' 

 VOL. XX, Xo. 22, TO VOL. XXI, Xo. 3. 



