CONTENTS 



CHAPTER I 

 Chemistry of Fertilizers 



PAGE 



The Four Fundamental Laws Nitrogen Potash Phos- 

 phoric Acid Lime Terms Used in Analyses Loss of 

 Fertilizer in Soils Indirect Fertilizers Direct Ferti- 

 lizers 1 



CHAPTER II 

 Origin and Composition of Soils 



Origin of Soil Geologically Considered Chemical Ele- 

 ments Present Non-metals Metals 15 



CHAPTER III 

 The Relation Between Soils and Fertilizing Materials 



Exhaustible Elements and Non-exhaustible Elements 

 Preference Shown by Plant Life Separate Fertilizing 

 Ingredients Economy in Separate Ingredients 30 



CHAPTER IV 



Pebble Phosphate Ore Dressing and Milling 

 Steam Shovels and Hydraulic Mining Practice 37 



CHAPTER V 

 Hard Rock Phosphate Ore Dressing and Milling 



Loss of Soft Ores Separating the Ores from Clays, etc., 



and Process of Roasting or Drying 43 



