CONTENTS. 

 PART FOURTH. 



CHAPTER XXIX. 



Improvement of the Soil by Chemical Means, Animal Manures 196202 



CHAPTER XXX. 

 Vegetable Manures 203208 



CHAPTER XXXI. 

 Composts 209212 



CHAPTER XXXII. 



Mineral Manures 213223 



CHAPTER XXXIII. 

 Manufactured Manures 224233 



PART FIFTH. 



CHAPTER XXXIV. 



The Structure and Growth of Plants 234240 



CHAPTER XXXV. 



The Functions of tlu> Roots 241245 



CHAPTER XXXVI. 



The Functions of the Stems .- 246218 



CHAPTER XXXVII. 



The Functions of the Leaves 249 252 



CHAPTER XXXVIII. 



The Functions of the Flower 253257 



CHAPTER XXXIX. 



The Fruit ; its Formation and its Characteristics 258263 



CHAPTER XL. 

 Improvement of Plants by Breeding and Crossing 264270 



PART SIXTH. 



CHAPTER XLI. 



The Culture of Farm Crops 271273 



CHAPTER XLII. 

 Implements of Tillage 274277 



CHAPTER XLIII. 

 The Rotation of Crops 278281 



