INDEX. 



Acids, account of those found 

 in vegetables, 96. 



Age of trees, by what limited, 

 225. 



Alcohol, theory of its forma- 

 tion, 119. 



Alburnum, uses of, 54, 225. 



Alkalies, method of ascertain- 

 ing their presence in plants, 

 99. 



effects produced by, in 



vegetation, 17 



Animal substances, their com- 

 position, 8cc. 245. 



decomposition of, 244. 



Atmosphere, nature and con- 

 stitution of, 183. 



Animal matter, mode of ascer- 

 taining its existence in soils, 

 148. 



Bark, its office and uses, 51, 



211. 

 Barks, their relative value for 



tanning skin, 8 1 . 

 Blight in corn, its cause, 236. 

 Bread, its manufacture, theory 



of its production, 123. 

 Burning, its use in improving 



soils, 309. 



Canker in trees, probable mode 

 of curing, 234. 



Carbonic acid, a part of the at- 

 mosphere, 186. 



necessary to vegetation, 



197. 



Cements, on those obtained 

 from limestone, 290. 



Chemistry, its application to 

 agriculture, 5. 



importance in ag- 



ricultural pursuits, 23. 

 Combustibles, simple, referred 



to, 40. 

 Combustion, supporters of, 



mentioned 39. 

 Courses of crops, particular 



ones recommended, 319. 

 Corn, its tillering, theory of 



this operation, 207. 



Diseases of Plants, their causes 

 discussed, 233. 



Earths, on those found in 

 plants, 101. 



Electricity, its influence on ve- 

 getation, 37. 



Elements chemical, of bodies, 

 40. 



laws of their com- 



binations, 46. 



Excrements, use of as ma- 

 nures, 261. 



Fairy rings, their causes, 319. 

 Fallowing, theory of, 21,315. 

 Fermentation, phenomena of, 



118. 

 Fly-turnip, plan for destroying 



or preventing, 195. 

 Flowers, their parts and office; 



61, 



