CHAPTER IX. 



The Different Kinds of Manure Notes on Vegetable Manures Animal 

 Products Their Annual Reckless Waste Estimate of the Loss to 

 Agriculture Hints on Their Preservation and Utilization Guanos 

 Described and Analyzed Their Variable Quality Fish Manures 

 Table of Nitrogenous Substances 44 



CHAPTER X. 



Farm-Yard Manures Composition of Their Liquid and Solid Elements 

 Comparative Value of Absorbents, with Analyses Composition of 

 Various Straws Superior Value of the Liquid Substance How to 

 Preserve and Utilize it Treatment of Manure Heaps How to Com- 

 plete Their Value as Fertilizers Their Decomposition Formation 

 and Description of Humus Experiments on Freshly-Made and Fer- 

 mented Manures Results of Each Experiment General Remarks 50 



CHAPTER XL 



Mineral Manures Bones, and What They Taught Us Sulphuric Acid and 

 Nitrate of Soda Bone Ash Animal Charcoal, or Bone Black Bone 

 Meal Sulphate of Ammonia : Its Great Power of Decomposing Other 

 Manures How to Detect Impure Nitrate of Soda Nitrate of Potash, 

 or Saltpetre Phosphate of Lime River Phosphates Canadian 

 Phosphate A Ridiculous Extortion 57 



CHAPTER XII. 



Sulphur Its Occurrence in Nature The Mines of Sicily The Refining 

 Process Iceland Soufrieres and Solfataras Use of Sulphur in Man- 

 ufacture Pyrites and How They Occur Analytical Tables General 

 Annual Consumption The Mines of Spain Described 69 



CHAPTER XIII. 



Sulphuric Acid Manufacture Sketch of Its Past History Pyrites Burn- 

 ingGlover's Towers Hints on the Construction of Leaden Chambers 



Chemistry of the Process Denitration Gay-Lussac Towers 

 General Remarks 75 



CHAPTER XIV. 



Superphosphates Uncertainty of Their Composition Their Manufacture 

 Described How to Manipulate When Made Nature of the Decom- 

 position Process Explanation of the Loss in Weight What is 

 Soluble Phosphate ? Discussion of Its Merits in the Field Its Ac- 

 tion in the Soil Necessity for Careful Analysis Made Further Manifest 



Precipitated Phosphates : Their Manufacture, Their Virtues and 

 Superiority Use of Complete Manures, with Examples and Statistics 



Remarks on Home-made Chemical Manures 80 



CHAPTER XV. 

 Chemical Analysis How to Read and Understand Chemists' Certificates 



Use of "Complete" and " Simple " Manures Conclusion 89 



