THE MECHANISM 



OF 



MENDELIAN HEREDITY 



BY 



T. H. MORGAN 



PROFESSOR OF EXPERIMENTAL ZOOLOGY 

 COLUMBIA UNIVERSITY 



A. H. STURTEVANT 



RESEARCH ASSIST.\NT, CARNEGIE INSTITUTION 



H. J. MULLER 



ASSOCIATE PROFESSOR OF ZOOLOGY 

 UNIVERSITY OF TEXAS 



C. B. BRIDGES 



RESEARCH ASSISTAN''. CARNEGIE INSTITUTION 



REVISED EDITION 



\> 



NEW YORK 

 HENRY HOLT AND COMPANY 



