TABLE OF CONTENTS xiii 



CHAPTER IX 



PAGE8 



Methods of Laying out a Breeding Plat . . . 94-100 

 How to conduct a breeding plat, 95 — The second 

 year's work, 98 — Continuation of breeding, several 

 plans, 99. ' 



CHAPTER X 



Eesults with Hybridization ...... 101-116 



Degrees of Relationship, 101 — Xenia, 103 — Mendel's 

 laws, 104 — Dominant and recessive characters, 105 — ■ 

 Hybridization, eflect on growth, 107 — Self-fertilization, 

 107^ — Pure strains, orbiotypes, 109 — Crossing biotypes, 

 111 — Crossing varieties. 111 — Isolating high-yielding 

 biotypes, 115. 



CHAPTER XI 



Acclimation and Yield 117-121 



Efiect of environment on the corn plant, 118 — Effect 

 of previous environment on yield, 119 — Adaptation of 

 the soil, 121. 



CHAPTER XII 



Cropping System in Relation to maintaining the Yield 



OF CoKN 122-128 



Cropping systems, 122 — Restoring production, 123 — 

 Maintaining production, 124 — Rotations for corn grow- 

 ing, 127. 



CHAPTER XIII 



Organic Matter 129-134 



Farmyard manure for corn, 130. 



