42 . VALUE OF FIKST-GENERATION HYBRIDS IN CORN. 



Page. 



Corn, crossing, experiments in Michigan, early 10-12, 29, 30 



New York 17-18, 29 



closely related strains 17-18, 29 



self-fertilized strains 17-18 



studies, value, etc 9, 15-17 



two varieties, benefits and methods 15-17 



increasing yields 8, 10-20 



culture, extension by first-generation hybrids 31-33 



importance of locally produced seed 33-34 



value of first-generation hybrid seed 3.3-34 



dent, crossing, experiments in Illinois 13-15 



diverse types, crossing, experiments 20-28, 29 



drought resistance, increase, experiments 31-33 



resistant type developed in Mexico 20-21 



value in extension of corn culture 31-33 



Edmonds X Burr's White, comparison with parent varieties 16-17 



Murdock, comparison with parent varieties 16-17 



Flour, second-year crossing 13-15 



flowering habits, studies 8 



Giant Missouri Cob Pipe, crossing, experiments 26 



Gold Coin X Eight-rowed, crossing, experiments 14-15 



Flour, crossing, experiments 14-15 



Triumph, crossing, experiments 14-15 



second-year crossing 13-15 



Guatemala red, crossing, experiments 26-27, 29 



Hairy Mexican, crossing, experiments 27, 28, 29 



Hopi, crossing, experiments 22, 24, 25, 29 



Huamamantla, crossing, experiments 27, 29 



hybrid Ah 3, Maryland dent X Hopi, crossing, experiments 22, 29 



4, Tuscarora X Cinquantino, crossing, experiments 22-23,29 



Dh 1, Kansas dent X Chinese, crossing, experiments 23,29 



2, Chinese X Chihuahua, crossing, experiments 23-24, 29 



3, Hopi X Chinese, crossing, experiments 24, 29 



4, Chinese X Xupha , ... 24, 29 



6, Brownsville X Chinese, crossing, experiments 25, 29 



Eh 1, Hopi X Algerian pop, crossing, experiments 25, 29 



Gh 2, Tom Thumb X Quezaltenango black, crossing, experi- 

 ments 25-26, 29 



Kh 31, Brownsville X Guatemala red, crossing, experiments 26, 29 



62, Guatemala redx Salvador black, crossing, experiments. 26-27, 29 

 Mh 13, Quarentano X Brownsville, crossing, experiments 27,29 



15, Huamamantla X Hairy Mexican, crossing, experiments. . 27, 29 



16, Arribeiio X Hairy Mexican, crossing, experiments 28, 29 



17, Hairy Mexican X Chinese, crossing, experiments 28, 29 



25, Mexican dent X Tom Thumb, crossing, experiments 28, 29 



hybrids, diverse types, new series 20-28, 29 



first-generation, and centralized seed production 33-34 



comparison with parent varieties 15-16, 28-31 



confusion with hybrid varieties 8-9 



disease resistance 32-33 



effect of vigor on production 9, 39-40 



experiments, previous 10-20 



191 



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