CONTENTS, 



Page. 



Introduction 7 



Peculiar habits of the corn plant 8 



First-generation hybrids confused with hybrid varieties 8 



Vigor of hybrids a factor of production 9 



Popular belief in the superiority of first-generation hybrids 9 



Pre\dous experiments with first-generation hybrids 10 



Experiments in Michigan 10 



Experiments in Indiana 12 



Experiments in Maine 13 



Experiments in Illinois 13 



Experiments in New York 17 



Experiments in Connecticut 18 



A new series of hybrids between diverse types 20 



Hybrid Ah3, Maryland dent by Hopi 22 



Hybrid Ah4, Tuscarora by Cinquantino 22 



Hybrid Dhl, Kansas dent by Chinese 23 



Hybrid Dh2, Chinese by Chihuahua 23 



Hybrid Dh3, Hopi by Chinese 24 



Hybrid l)h4, Chinese by Xupha 24 



Hybrid Dh6, Brownsville by Chinese 25 



Hybrid Ehl, Hopi by Algerian pop 25 



Hybrid Gh2, Tom Thumb by Quezaltenango black 25 



Hybrid Kh31, Brownsville by Guatemala red 26 



Hybrid Kh62, Guatemala red by Salvador black 26 



Hybrid Mhl3, Quarentano by Brownsville 27 



Hybrid Mhl5, Huamamantla by Hairy Mexican 27 



Hybrid MhKi, Arribeiio by Hairy Mexican 28 



Hybrid Mhl7, Hairy Mexican by Chinese 28 



Hybrid ]\Ih25, Mexican dent by Tom Thumb 28 



Yields of first-generation hybrids 28 



Extension of corn culture by first-generation hybrids 31 



First-generation hybrids and centralized seed production 33 



First-generation hybrids in sweet corn 34 



Methods for testing corn hybrids 35 



Different methods of producing hybrid seed 37 



Conclusions 39 



Index 41 



101 5 



