o°*' „\** 



:\* 



PIEBALD RATS AND SELECTION 



AN EXPERIMENTAL TEST OF THE EFFECTIVENESS OF 



SELECTION AND OF THE THEORY OF GAMETIC 



PURITY IX MENDELIAN CROSSES 



BY 



W. E. CASTLE and JOHN C. PHILLIPS 



WASHINGTON, D. C. 

 Published by the Carnegie Institution op Washington 



1914 



