INDEX. 



4\l 



QANDY soil, productive power of, 139 



O and loam compared, 140 



Sap, Hales' experiments on the motion 



of, 359 

 Saxon expiriments witli lime, 3oO 



■ on unmaniired land, 190 



with farm-yard manure, 208, 218 



with bono-eiu-tb, 279 



with rape-cake, 283 



profit and loss of nitrogen in the 



soil, 291 

 Schattenmann's experiments with salts 



of ammonia. 297 

 Schmid, on nitrogen in Eussian black 



soil, 311 

 Schiinbein, nitrite of ammonia in 



oxidation and combustion discovered 



by, 326 

 Sea-salt, experiments with, by Kuhl- 



mann, 336 

 with cereals, experiments by Ea- 



varian society, 336 

 Seed«, germination and growth of, 3 



— conditions for the formation of, 49 



— eflfect of mineral matter on the growth 

 of, 44 



— functions of nitrogenous matter of, 

 43 



— importance of good, 7 



— selection of, 8 



Silicates, effect of organic matter in 



soils, in the diffusion of, 80 

 Siliceous plants, removed by drainage, 



81 

 Silicic acid, deficiency or excess in soils 



injurious, 81 



excess of, how remedied, 82 



distribution of, promoted by 



growth of grass, 80 

 Soil and subsoil, 64 



— when fertile, 65 



— chemical analysis of, no guide to its 

 productive power, 63, 114 



— exhausted, how restored to fertility, 

 73 



— estimation of substances physically 

 combined in, 119 



— for wheat, rj-e, and oats, 115, 121 



— different layers of, contain food for 

 different plants, 154 



— change produced by cereals in, 226 



— composition of, restored by fodder 

 plants, 227 



— distillation of, with alkalies, 313 



— from bogs and ditches, fertilising 

 effect of, 99 



— exhaustion of, in Ehenish Bavaria, 

 245 



— food in, not inexhaustible, 244, 

 247 



TOB 



Soil, fertility of, not due to its nitrogen, 

 305 



— importance of improving the physical 

 condition of, 89 



— mineral matters of, lost in corn and 

 eattl.' sold, 228 



— nutritive power of, estimated by 

 amount of food physically combined, 

 72 



— productive power of, estimated by 

 the avaihible nitrogen in form of am- 

 monia and nitric acid, 307 



— progress of exhaustion of, 167 



— production of corn and straw in, 

 diu-ing the progress of exhaustion, 

 172 



— restoration of productive power to, 

 requires niti'Ogeuous as well as mine- 

 ral food, 328 



— restoration of nitrogenous food to, 

 effected by fodder plants, 329 



— permeability of, to manures, 223 



— productive power of, 125 



— proper relation between food ele- 

 ments in for fertility, 127 



— upper layers of, retain the diuig 

 constituents, 228 



— saturated with mineral matter, ma- 

 nuring with, 143 



— absorptive power of, 67 

 effects chemical decompo- 

 sition, 69 



knowledge of, valuable, 225 



for potash, 124 



for ammonia increased by 



organic matter, 141 

 for phosphates of lime and 



magnesia, 136 



— for silicic acid, 138 



Starch in stems of palms, 357 

 Stohmann, experiments on the growth 



of plants in solutions of their food, 380 

 Straw, formation of, 199, 203 

 Subsoil, accumulation of organic matter 



in, injurious to deep-rooting plants, 83 



— period of exhaustion of, 230 



— mineral matter of, supplied to sur- 

 face soil by fodder plants, 227 



— not reached by mineral matters of 

 manures, 156 



Superphosphates, 276 



— experiments with, 147 



TILLAGE, beneficial action of, 113 

 Tobacco plant, mode of growth of, 

 28 

 quantity of albumen and nico- 

 tine in, modified by treatment in 

 growth, 31 



