INDEX. 251 



PAGE. 



MECHANICAL TREATMENT or THE SOIL 23 



MINERAL FERTILIZERS THEIR ACTION UPON THE SOIL.... 211 



Silex 211 



Lime 212 



Gypsum Sulphate of Lime or Plaster 215 



Marl 215 



' Potash 216 



Soda 216 



Magnesia 217 



Sulphur 217 



Phosphorus 218 



Analysis of Bones 219 



Calcined Bones 220 



Sugar-house Eefuse 220 



Chilian Saltpetre, or Common Salt 222 



'Columbian Guano 222 



Quartz 223 



Artificial Silicates 224 



Acids 225 



MUCK, OR VEGETABLE MOLD......... 46 



MUTUAL ACTION OF THE ORGANIC AND INORGANIC ELE- 

 MENTS or THE SOIL 206 



PEA CROP 107 



Varieties 108 



Soil 108 



Planting, or Sowing . 109 



POTATO CROP 



Climate 117 



Soil 118 



Varieties 118 



Plant Beds 119 



Preparation of Beds 120 



Sowing the Seed..... 121 



Preparation of Soil 122 



Planting 123 



Culture 124 



Digging 137 



