XVI 



CONTENTS 



to Roots, 103 — The Flow of Sap, 104— The Cambium 

 Layer, 104 — Rope, Twine and Linen Material, 105. 



CHAPTKR Xn 



Thb Work op Flowebs 107-116 



The Work in which All Parts join, 107 — What the 

 Flower does, 107 — Parts of the Flower on Separate 

 Plants or on Different Parts of the Same Plant, 110 — 

 How the Pollen gets from one Plant to another, 110 — 

 The Flowers which depend upon Insects to carry Pollen, 

 111 — The Flowers which depend upon Wind to carry 

 Pollen, 111 — What happens after the Pollen reaches 

 the Stigma, 112 — Cross-fertilization the Rule, 113 — 

 Cross-fertilization by Hand, 113. 



CHAPTER XIII 

 The Fokmation and Development op Seed . . . 117-121 

 How the Food is stored in the Seed, 117 — How Man 

 may thwart Nature's Plan, 118 — The Forms and Uses 

 of the Various Food Materials in the Seed, 120. 



CHAPTER XIV 



The Propagation of Plants 



122-144 



How Plants are Propagated, 122 — Propagation by 

 Spores, 124 — How Spores are Spread, 127 — How to 

 prevent the Spread and Growth of the Spores of Disease, 

 128 — Conditions which favor the Entrance and Growth 

 of Spores, 133 — Propagation by Seed, 133 — Propaga- 

 tion by some Part of the Plant other than Seed or 

 Spore, 134 — Plants formed while still attached to the 

 Parent Plant, 134 — Plants formed by Portions which 

 become detached from Parent Plant, 136 — Plants formed 

 by the Union of Two Plants, 138. 



CHAPTER XV 



Why Man Cultivates Plants 145-148 



Classes of Plants according to the Parts for which 

 they are cultivated, 145. 



