RESULTS OF HYBRIDIZING WHEAT 513 



yields well and will " come true to seed." More important 

 results may be expected in the future from hybridizing wheats 

 than any yet attained. 1 



1 The literature of plant breeding is extensive and rapidly increasing. An 

 excellent general account of the subject and full bibliography is contained 

 in Plant Breeding by L. H. Bailey, The Macmillan Company, New York and 

 London, 1906. 



A valuable summary of the main topics of plant breeding is contained in 

 Bulletin No. 29, 1901, of the Division of Vegetable Physiology and Pathology 

 of the United States Department of Agriculture. 



Much information is also given in Hugo de Vries, Species and Varieties : 

 their Origin by Mutation, Open Court Publishing Company, Chicago, 1905. 



Other publications of the United States Department of Agriculture on 

 plant breeding are : 



For corn, Farmer's Bulletin No. 229, 1905. 



For wheat, Bureau of Plant Industry, Bulletin No. 78, 1905. 



Division of Vegetable Physiology and Pathology, Bulletin No. 24, 1900. 

 The publications of most of the Agricultural Experiment Stations contain 

 much important material for the discussion of plant breeding. A few of these 

 are as follows : 



For corn, University of Illinois Agricultural Experiment Station, Circular 



No. 74, 1904 ; Bulletins Nos. 55, 82, 1902 ; 87, 1903 ; 100, 1905. 

 Ohio Agricultural Experiment Station, Bulletin No. 140, 1903. 

 Kansas Agricultural College, Bulletin No. 107, 1902. 

 Nebraska Agricultural Experiment Station, Bulletin No. 91, 1905. 

 For wheat, University of Minnesota Agricultural Experiment Station, 



Bulletin No. 62, 1899. 



Ohio Agricultural Experiment Station, Bulletin No. 165, 1905. 

 The authors wish to express their obligations to all the authorities above- 

 mentioned. They have also to thank Assistant Secretary Willet M. Hays, 

 of the Department of Agriculture, for his kindness in reading and copiously 

 annotating the present chapter. 



