INDEX. 
399 
Page 
Metallic oxides, those found in plants 105 
Metals, account of. 4-6 
Mildew, cause of 240 
Oils, fixed, their nature and production 94 
Oxygene, its presence in the atmosphere, and uses 194 
necessary to germination 195. 214 
Paring and burning, theory of their operation 313 
Pasture, where advantageous 326 
Peat mosses, on their formation 174 
— on their improvement 187 
Pith, nature of 58 
Plants, organization of 53. 127 
- — — < parasitical, described as the cause of disease in 
corn 239 
parts of 53 
Putrefaction, methods of preventing 251 
Quicklime, injurious to soils' . 287 
Rocks, their number and arrangement 176 
. — those from which soils are derived, or on which 
they rest 180 
Salts, their uses as manure 264. 282 
on such as are found in vegetables 105 
on those found in soils, account of 144 
Sap, cause of its ascent discussed 218 
course of. 8. 216 
- — — its composition discussed 135 
Seeds, on those produced by crossing 237 
germination of 195 
* their nature and uses 66 
Simple substances described 41 
Soils, properties of.... 147. 163 
composition of. 143. 160 
method of analysing 145 
formation of 172 
■ their constituent parts 141 
■ — improvement of.. 186 
their classification 184 
Soot, properties of, as a manure 278 
Subsoils, varieties of, and their effects t 171 
Sugar, mode of refining 74 
