CONTENTS 



XV 



CHAPTER VIII 



Seed Germination 



What a Seed is, 62 — Two Great Classes of Plants, 62 

 — The Conditions required for Seed Germination, 64 — 

 Moisture and Germination, 65 — Temperature and Ger- 

 mination, 67 — Changes which take place within the 

 Germinating Seed, 68 — Heat generated during Germi- 

 nation, 71 — How Size of Seed affects Growth of Young 

 Plant, 73 — Direction of Growth, 74 — The Embryo be- 

 comes a Seedling, 76. 



PAGKS 



62-76 



CHAPTER IX 



The Work of Roots 



What Boots do, 77 — Gathering Food and Moisture, 

 77 — Boots are able to select the Minerals which they 

 need, 79 — The Origin of Boots, 80 — How Boots work 

 their Way through the Soil, 81 — The Extent and Depth 

 of Boots, 82 — How Boots help dissolve Mineral Matter, 

 84— How Boots hold Plants Erect, 85 — The Boot a 

 Storehouse of Food, 87 — Benefits of Boots, 88. 



77-88 



CHAPTER X 



The Work of Leaves 



Functions and Uses of Leaves, 89 — Tfie Manufacture 

 of Starch, 89 — The Green Leaf likened to a Mill, 90 — 

 How Other Foods are made, 91 — Amount of Water, 

 Food Material, and Ash in Plants, 92 — The Water 

 given off by Leaves, 93 — Storage of Food in the 

 Leaves, 96. 



89-97 



CHAPTER XI 



The Work of Stems 



The Functions of Stems, 98 — The Forms of Stems, 

 98 — Prostrate Stems, 98 — Climbing Stems, 99 — Erect 

 Stems, 99 — Study of the Forms of Stems, 100 — How 

 Water travels from Boots to Leaves, 101 — How to tell 

 the Age of a Tree, 102 — How Food travels from Leaves 



98-106 



