OF CONTENTS.^ 



PART FIRST 



PAGE. 

 CHAPTER I. 



The Culture of Farm Crops 711 



CHAPTER II. 

 Kinds and Condition of matter 1215 



CHAPTER III. 

 arbon. Its Properties and Relations to Vegetable Life 1620 



CHAPTER IV. 



Oxygen. Its Properties and Relations to Life 2127 



CHAPTER V. 

 Hydrogen and Nitrogen. Their Compounds and Relations to 



Vegetable Growth 32 



CHAPTER VI. 



Combinations of Organic Substances 33 39 



CHAPTER VII. 



The Atmosphere 40 44 



CHAPTER VIII. 



Water. Its Relations to Vegetable Life 4551 



CHAPTER IX. 



Heat and Cold. Their Influence upon Matter and Vegetation 52 59 



CHAPTER X. 



Carbonic Acid. Its Properties and Functions in Plant Growth 6064 



CHAPTER XI. 



Nitric Acid. Its Composition and Uses in the Growth of Crops 65 69 



CHAPTER XII. 



Ammonia. Its Composition, Properties and Relations to Vege- 

 table Growth 7077 



