BKEEDING 



CROP PLANTS 



BY 

 HERBERT KENDALL HAYES 



PROFESSOR OF PLANT BREEDING, COLLEGE OF AGRICULTURE, 

 UNIVERSITY OF MINNESOTA 



AND 



RALPH JOHN GARBER 



FORMERLY ASSISTANT PROFESSOR OF PLANT BREEDING, COLLEGE OF AGRICULTURE; 

 UNIVERSITY OF MINNESOTA", NOW ASSOCIATE PROFESSOR AND HEAD OF, ' 

 THE DEPARTMENT OF AGRONOMY, UNIVERSITY OF WEST VIRGINIA^ ' ' 



FIRST EDITION 



McGRAW-HILL BOOK COMPANY, INC. 



NEW YORK: 370 SEVENTH AVENUE 



LONDON: 6 & 8 BOUVERIE ST., E. C. 4 



1921 



