PIEBALD RATS AND SELECTION 



AN EXPERIMENTAL TEST OF THE EFFECTIVENESS OF 



SELECTION AND OF THE THEORY OF GA^IETIC 



PURITY IN MENDELIAN CROSSES 



QH\Ay 



'?3N5 



BY 

 W. E. CASTLE AND JOHN C. PHILLIPS 



0H431 

 C37 



WASHINGTON, D. G. 

 Published by the Caknegie Institution of Washington 



1914 



