398 
INDEX. 
Page 
Elements, chemical, of bodies 39 
laws of their combinations 49 
Excrements, use of, as manures 267 
Fairy rings, their causes 324 
Fallowing, theory of 21. 319 
Fermentation, phenomena of 121 
Flowers, their parts and office 64 
Fly, turnip, plan for destroying or preventing 201 
Geology, referred to as teaching the nature of rocks 176 
Grafting, general views on this process ...» 228 
Grasses, on those fit for pasture 327 
Gravitation, its effects on plants . 29 
Green crops recommended 321 
Gypsum, its use as a manure 297 
Heat, its effects on vegetables 34. 163 
Husbandry, drill, its advantages 321 
Ice, its anti-putrescent powers 251 
Irrigation, theory of its effects 317 
Irritability, vegetable, its existence doubted 223 
Land, causes of its fertility 183 
— —barrenness 186 
Leaves, their functions 61 
Light, its effect on vegetation. 204 
Limestone, its nature and uses 19. 285 
action in the soil 20 
— mode of burning 297 
— magnesian, its peculiar properties 21. 291 
Lime, mode of ascertaining the quantity, in limestones and 
soils 151 
— — — — salts of, on the mode of detecting them in soils 156 
Malting, theory of the process of. 198 
Manures, on their applications 243 
how taken into the vegetable system 244 
fermentation of 6. 273 
in what state to be used 275 
• animal 267 
mineral 290 
— — vegetable 253 
saline 264. 282 
Matter, powers of, discussed 29 
Meat, method of preserving it 252 
