156 



INDEX. 



Gas Liquor . . ' . 133 



Lime .... 135 

 Gluten, its Analysis . . 58 

 of Wheat . .91 

 Guano .... 127 

 Gypsum .... 102 



Heat, its effects . . .122 



Henry on Nitrates . . 90 



Humic Acid , . ,85 



Humus . . . .40 



Hydrogen . . .79 



Magnesia .... 107 

 Manufacture of Saltpetre . 81 

 Manures . . . .112 

 Moisture . . . .21 



Night Soil . . . .136 



Nitrate of Lime . 106,83 



Soda . . 90 



Nitrogen . . . .56 



Oils 116 



Oxygen . . .44, 72 



Peat Ashes . . .116 



Phosphate of Lime . . 99 



Magnesia . 107 



Phosphorus . . .98 



Plants, Structure of . .14 



absorb Carbon . . 46 



purify the air . . 54 



Potash . . . .79 



Process of Asshnilation . 71 



Rain 61 



Rock Salt . . . .87 

 Roots of Plants ... 16 

 Rotation of Crops . , 28 



Salt 86 



Saltpetre . . . 10, 80 

 Seeds . . . .20 



Silex . . . .109 



Soda . . . .85 



Soil . . .26, 138 



Spongelets of the Roots . 16 

 Starch .... 65 

 Stem of Plants ... 17 

 Sugar made in France . 9 

 Sulphate of Ammonia . 103 



Sulphuric Acid . . 143 



Teeth, Composition of . 78 



Volcanoes yield Ammonia . 66 



Urine . . . .139 



Wheat manured with 139 



Water 



its uses 

 Wheat 



Straw 

 Wood Ashes 

 Woollen Rags 



139, 



36 

 69 

 59 



. 77 



83,114 



. 151 



