Bulletin No. 29. v. p. P.-83. 



U. S. DEPARTMENT OF AGRICULTURE, 



DIVISION OF YEGETABLE PHYSIOLOGY AND PATHOLOGY. 



ALBERT F. "WOODS, Chief. 



PLANT BREEDING. 



BY 



KfcW YORK 

 ^B O T A N I C A 



WIIvIvET M. HAYS, 



Professor of Agriculiure, University of Minnesota. 



WASHINGTON: 



GOVKRNMKNT PRINTING OFFICE, 

 I 9 O I . 



