INDEX, 



Hocks, those from which soils I Trees, age of, 226. 

 are derived, or oh which I 

 they rest, 175. 



Sap, cause of its ascent discus- 

 sed, 211. 



course of 8, 209. 



^ its composition discus- 

 sed, 131. 



Salts their uses as manure, 

 261,279. 



on such as are found in 



vegetables, 102. 



on those found in soils, 



account of, 139. 



Seeds, on those produced by 

 crossing, 229. 



germination of, 189. 



their nature and uses, 63. 



Simple substances described, 

 40. 



Soils, properties of, 157, 142. 



composition of, 136, 154. 



method of analysing, 140. 



formation of, <66. 



their constituent parts, 



136. 



improvement of, 181. 



their classification, 178. 



Subsoils, varieties of, and their 

 effects, 166. 



Soot, properties of as a ma- 

 nure, 274. 



Sugar, mode of refining, 71. 



Tanning principle, its applica- 

 tion to tanning, 79. 



- quantity in differ- 

 ent barks, 80. 



artificial, 83. 



Temperature of soils discus- 

 sed, 158. 



Trees, habits of, discussed, 

 232. 



cause of their decay, 



225. 



Urine, its use as a manure, 

 261. 



Vegetables, their chemical 

 composition, 6f . 



improvement of, by cul- 

 tivation, 228. 



renovation of the at- 

 mosphere, 203. 



the causes of their 



growth discussed, 220. 



Vegetable matter, mode of as- 

 certaining its quantity in 

 soils, 148. 



its analysis, 107. 



decomposition of, 



described, 244. 



principles, their ar- 

 rangement in plants, 123. 



Vegetable life, phenomena of, 

 discussed, 219. 



matter, decomposition 



of, 242. 



Vegetation, influenced by gra- 

 vitation, 29. 



influence of light in, 



208. 



progress of, 195, 

 302. 

 its effect on a soil. 



318. 



Veins or mines, their situa- 

 tions, 174. 



Water, absorption of by soils, 

 161. 



its state in the atmos- 

 phere, 186 



Wheat, transplantation of, 208. 



crossing of, 228. 



Wines, theory of their forma- 

 tion, 119. 



quantity of spirits they 



contain, 121. 



