ORTHOGENETIC EVOLUTION 



IN PIGEONS 



POSTHUMOUS WORKS OF CHARLES OTIS WHITMAN 



PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF CHICAGO, I892-IQIO; DIRECTOR OF MARINE P C 



BIOLOGICAL LABORATORY AT WOODS HOLE, [888-I908 



EDITED BV 



OSCAR RIDDLE 



RESEARCH ASSOCIATE OF THE CARNEGIE INSTITUTION OF WASHINGTON 



VOLUME I 



PUBLISHED BY 



THE CARNEGIE INSTITUTION OF WASHINGTON 



Washington, 1919 



