GENETICS AND EUGENICS 



A TEXT-BOOK FOR STUDENTS OF BIOLOGY AND 



A REFERENCE BOOK FOR ANIMAL 



AND PLANT BREEDERS 



BY 



W. E. CASTLE 



PROFESSOR OF ZOOLOGY IN HARVARD UNIVERSITY AND 



RESEARCH ASSOCIATE OF THE CARNEGIE 



INSTITUTION OF WASHINGTON 





Private Prot:jerfy of 



^^ P. METCALF 



»yjaa a ia it « » i* r *tittfcM 



/ 



CAMBRIDGE 

 HARVARD UNIVERSITY PRESS 



LONDON: HUMPHREY MILFORD 



Oxford University Press 



1921 



