186 



INDEX. 



Rastadt, soldiers 1 food and excrements. 



259 

 Restoration, Jaw of, properly interpreted, 



240 

 Rhenish Bavaria, exhaustion of eo.l of, 



235 



River waters, analyses of, 348 

 Roots, absorption of miner:;! matters by, 



70,89 



absorption of food by, not an osmotic 

 process, 65 



do not offer permanent resistance to 

 the chemical action of salts, 68 



importance of their developement in 

 cereals, 48 



mode in which they absorb food, 106 



length of, 28 



power of selection of food in, 63, 67 



principal conditions for the formation 

 of, 226 



spread in search of food, 93 

 Rotation, succession of crops in, de- 

 pendent on the cereals, 227 



system of, does not ultimately increase 

 corn crops, 232 



general results obtained in the Saxon 

 experiments by, 270 



Rye, cultivation of, instead of wheat, 

 shows deterioration of soil, 235, 



soil, 120 



conversion of, into wheat soil, 127 



S 



Sandy soil, productive power of, 141 



and loam compared, 142 



Sap, Hales' experiments on the motion 

 of, 338 



Saxon experiments with lime, 330 



on unmatiured land, 18 



with farm-yard manure, 203, 211 



with bone-earth, 265 



with rape-cake, 268 



profit and loss of nitrogen in the 



soil, 276 



Schattenmann's experiments with salts 

 of ammonia, 281 



Schmid, on nitrogen In Russian black 

 soil, 294 



Schonbein, nitrite of ammonia in oxida- 

 tion and combustion discovered by, 

 308 



Sea-salt, experiments with, by Kuhl- 

 mann, 317 



with cereals, experiments by Ba- 

 varian Society, 317 



Seeds, germination and growth of, 20 



conditions for the formation of, 61 



effect of mineral matter on the growth 

 of, 57 . 



functions of nitrogenous matter of, 56 



importance of good, 24 



selection of, 25 



Silicates, effect of organic matter in soils, 



in the diffusion of, 89 

 Siliceous plants, removed by drainage, 



89 

 Silicic acid, deficiency or excess in soils 



injurious, 90 



Silicic acid, excess of, how remedied, 



90 

 distribution of, promoted by growth 



of grass-, 89 

 Soil und subsoil, 75 



when fertile, 75 



chemical analysis of, r;o guide to its 

 productive power, 74, 118 



exhausted, how restored to fertility, 

 83 



estimation of substances physically 

 combined in, 124 



for wheat, rye, and oats, 120, 125 



different layers of, contain food for 

 different plants, 155 



change produced by cereals in, 218 



composition of, restored by fodder 

 plants, 219 



distillation of, with alkalies, 296 



from bogs and ditches, fertilising ef- 

 fect of, 105 



exhaustion of, in Rhenish Bavaria, 

 235 



food in, not inexhaustible, 234, 236 



fertility of, not due to its nitrogen, 

 289 



importance of improving the physical 

 condition of, 97 



mineral matters of, lost in corn and 

 cattle sold, 220 



nutritive power of, estimated by 

 amount of food physically combined, 

 82 



productive power of, estimated by the 

 available nitrogen in form of ammonia 

 and nitric acid, 297 



progress of exhaustion of, 1G6 



production of corn and straw in, dur- 

 ing the progress of exhaustion, 170 



restoration of productive power to, 

 requires nitrogenous as well as miner- 

 al food, 309 



restoration of nitrogenous food to, ef- 

 fected by fodder plants, 310 



permeability of, to manures, 216 



productive power of, 129 



proper relation between food elements 

 in for fertility, 130 



upper layers of, retain the dung con- 

 stituents, 220 



saturated with mineral matter, ma- 

 nuring with, 145 



absorptive power of, 77 

 effects chemical decomposi- 

 tion, 79 



knowledge of, valuable, 217 



for potash, 128 



for ammonia increased by or 



ganic matter, 143 

 for phosphates of lime and 



magnesia, 139 



for silicic acid, 140 



Starch in stems of palms, 336 

 Stohmann, experiments on the growth of 



plants in solutions of their food, 356 

 Straw, formation of, 194, 197 

 Subsoi., accumulation of organic matter 



in, injurious to deep-rooting plants, 91 



period of exhaustion of, 222 



