XIV CONTENTS 



CHAPTER IV 



FAOEB 



The Temperatdre of the Soil . ... 30-35 



Proper Temperature Necessary for Germination, 30 — 

 How Temperature of the Soil is governed, 30 — How the 

 Air Space in a Soil affects its Temperature, 81 — How 

 the Moisture iu a Soil affects its Temperature, 33 — How 

 the Color of a Soil affects its Temperature, 34 — The 

 Advantages of a Warm Soil, 34. 



CHAPTER V 



The Tillage of Soils 36-43 



Why we till the Soil, 36 — Improving the Texture and 

 Structure of the Soil, 36 — One Cause of Cloddy Fields, 

 39 — Covering, or Working into the Soil, Organic Mat- 

 ter, 40 — Putting Seed into the Seed Bed, 40 — Destroy- 

 ing Weeds, 41 — rorming a Dust Mulch, 42 — Making 

 it Possible for Air and Water to enter the Soil, 42. 



PLANT LIFE 



CHAPTER VI 



The Rodnd of Plant Life 44-45 



The Life Cycle of Plants, 44 — How the Parts of a 

 Plant work together, 44. 



CHAPTER VII 



The Seed : Its Selection and Distribdtion . . . 46-61 

 The Functions of the Seed, 46 — How the Embryo is 

 protected, 46 — How Seeds are scattered by Nature, 46 

 — How Seeds are scattered by Man, 49 — Making a 

 Seed Collection, 50 — How Nature selects Seeds, 52 — 

 How Man selects Seeds, 52 — Selecting Specimens for 

 Com Judging, 56 — Nature stores No Seeds but provides 

 for Loss, 57 — Man's Storage of Seeds, 58. 



