CONTENTS XI 11 



Chapter Page 



Ridging the land 98 



Time to plow 98 



Bare fallow 100 



XII. HARROWING AND ROLLING 101 



Harrowing : 



Why we harrow 



Time to harrow 101 



Types of harrows 102 



Rolling 106 



XIII. LEAVES 108 



Facts about leaves 108 



The uses of leaves to plants : 



Transpiration 



Starch making 



Digestion of food 



Conditions necessary for leaf work . 109 

 How the work of leaves is interfered with 115 



XIV. STEMS 120 



What are stems for? 120 



How the work of the stem may be inter- 

 fered with 126 



XV. FLOWERS 128 



Function of flowers 128 



Parts of flowers 129 



Functions of the parts : 



Cross pollination 130 



Value of a knowledge of the flowers . . 134 

 Fruit J 36 



