INDEX. 



Geology, referred to as teach- 

 ing the nature of rocks, 170. 



Grafting, general views on this 

 process, 226. 



Grasses, on those fit for pas- 

 ture, 322. 



Gravitation, its effects on 

 plants, 29. 



Green crops recommended, 

 317. 



Gypsum, its use as a manure, 



Heat, its effects on vegetables, 

 34, 158. 



Husbandry drill, its advan- 

 tages, 317. 



Ice, its anti-putrescent pow- 

 ers, 24 S. 



Irrigation, theory of its effects, 

 313. 



Irritability, vegetable, its exis- 

 tence doubted, 216. 



Land, causes of its fertility, 

 179. 



barrenness 180. 



Leaves, their functions, 58. 

 Light, its effect on vegetation, 



197, 

 Limestone, its nature and uses, 



19, 281. 



-action in the soil, 19. 



mode of burning, 



293. 

 magnesian, its peculiar 



properties, 21, 287. 

 Lime, mode of ascertaining 



the quantity in limestones 



and soils, 147. 

 salts of, on the mode of 



detecting them in soils, 152, 



Manures on their applications, 

 239. 



how taken into the ve- 

 getable system, 240. 



Manures, fermentation of, 6, 



269. 



in what state to fee 



used, ?69. 



animal, 261. 



mineral, 285. 



vegetable, 249. 



saline, 260, 279. 



Malting, theory of the process 



of, 192. 

 Matter, powers of discussed, 



28. 



Metals, account of, 42. 

 Metallic oxides, those found 



in plants. 104. 

 Mildew, cause of, 236. 

 Meat, method of preserving it, 



248. 



Oils, fixed, their nature and 



production, 92. 

 Oxygene, its presence in the 



atmosphere, and uses, 188. 



. necessary to germina- 

 tion, 179, 206. 



Paring and burning, theory of 

 their operation, 309. 



Pasture, where advantageous, 

 322. 



Plants, organization of, 50^123. 



Plants, parasitical, described as 

 the cause of disease in corn, 

 234. 



Peat mosses, on their forma- 

 tion, 169. 



on their improve- 

 ment. 181. 



Putrefaction, methods of pre- 

 venting, 248. 



Pith, nature of, 56. 



Plants, parts of, 50. 



Quicklime, injurious to soils, 



283, 



Rocks, their number and ar- 

 rangement, 171. 



