INDEX 
A .rage 
cids, account of those found in vegetables 97 
Age of trees, by what limited 228 
Alburnum, uses of 57 . 228 
Alcohol, theory of its formation 122 
Alkalies, method of ascertaining their presence in plants 102 
effects produced by, in vegetation 17 
Animal mattter, mode of ascertaining its existence in soils 153 
substances, their composition, &c 249 
decomposition of 247 
Atmosphere, nature and constitution of 189 
Bark, its office and uses 58. 222 
Barks, their relative value for tanning skin , 83 
Blight in corn, its cause 240 
Bread, its manufacture, theory of its production 126 
Brome 43 
Burning, its use in improving soils 312 
Canker in trees, probable mode of curing 238 
Carbonic acid, a part of the atmosphere 192 
necessary to vegetation 203 
Cements, on those obtained from limestone 294 
Chemistry, its application to agriculture 4 
importance in agricultural pursuits 23 
Combustibles, simple, referred to 42 
Combustion, supporters of, mentioned 40 
Corn, its tillering, theory of this operation 214 
Courses of crops, particular ones recommended 322 
Diseases of plants, their causes discussed 237 
Earths, on those found in plants 10 
Electricity, its influence on vegetation 3 
