MONOGRAPHS ON EXPERIMENTAL BIOLOGY 



EDITED BY 



JACQUES LOEB, Rockefeller Institute 



T. H. MORGAN, Columbia University 



W. J. V. OSTERHOUT, Harvard University 



INBREEDING AND, OUTBREEDING 



THEIR GENETIC AND SOCIOLOGICAL 

 SIGNIFICANCE 



BY 

 EDWARD M. EAST, PH.D. 



AND 



DONALD F. JONES, Sc.D. 



