1010 



C57 



PIEBALD RATS AND SELECTIOX 



AN EXPERIMENTAL TEST OF THE EFFECTIVENESS OF 



SELECTION AND OF THE TIIEOKY OF GAMETIC 



PURITY IN MENDELLVN CROSSES 



BY 

 W. E. CASTLE AND JOHN C. PHILLIPS 



WASHINGTON, D. C. 



Published bt the Carvegie Institution of Washington 

 19U 



