INDEX. 



383 



Cunnersdorf, soil, depth to -which ma- 

 nure penetrates, 217 



produce with guano compared with 

 farm-yard manure, 255 



produce with bone-earth and com- 

 parison with guano, 264 



produce with rape cake, 268 



experiments, effect of the nitrogen in, 

 270 



Decreasing crops, progress of, 168 

 Diffusion, law of, does not explain the 



absorption of food by roots of plants, 



65 



experiments, 68 



Disinfection of excrements does not af- 

 fect their energy, 261 



Distribution of food by chemical and 

 mechanical means, 95 



Drainage, effect of, 98, 102 



removal of siliceous plants by, 90 



water, its composition, 98 

 analysis of, 341 



docs not dissolve the food of plants, 



102, 103, 108 

 Duckweed, power of selection in roots 



of, 64 

 Dung, mechanical action of, 147 



Earthy phosphates, 262 



effect of, less marked in firet year, 



264 

 diffusion of, through the coil, how 



effected, 84, 86, 139 

 require the presence of potash and 



silicic acid in the soil, 264 

 and guano, comparative experi- 

 ments with, 264 

 European husbandry, present state of, 



228 

 decline of, produced by the system 



of farm-yard manuring, 260 

 illustrated by Hessian Rhine 



district, 242 

 Excrement, contain ash of food, 181 



of man, 260 



collection of, in Rastadt, 260 



value of, 260 



not injured by disinfecting with 



sulphate of iron, 261 

 Exhaustion of soils, its nature, 83, 85, 206 



known by the average crop, 241 



in chemical and agricultural 



sense, 165 



law of, 165 



retarded by growth of fodder 



plants, 173 



of wheat, oat, and rye soils, 170, 175 



Fallow, 83 



False teachers in agriculture, 230, 237 



Farm-yard manure, 145 



Farm-yard manure, effect of, varies with 

 the composition of the soil, 206 



depends on the minimum 



nutritive matters in the soil, 207 



its mechanical action, 208 



restores fertility only by sup- 

 plying one or more deficient ingre- 

 dients of the soil, 207, 221 



law regulating the quantity to 



be applied, 211 



produce from, 203 



in the Saxon experiments 



not always equal to the quantity ap- 

 plied, 203 



why generally useful, 208 



Saxon experiments with, 203, 



211 



manuring system, 184, 218, 227 



changes produced in the com- 

 position of the soil by, 218 



final result of, 223 



illustrated in the 



Saxon experiments, 223 



Fodder plants, proportion retained in 

 bodies of animals, 219 



transfer food from subsoil to sur- 

 face soil, 41 



Fontinalis, antipyretica, ash analysis of, 

 347 



Food, physically and chemically co"m- 

 bined in soils, 81 



not absorbed by plants from solutions 

 in soils, 93, 102, 108 



diffusion of, in soils, how effected, 

 84,87 



by chemical and mechanical 



means, 95 



closeness of in soils, 192 



Grouven, analysis of diseased clover, 378 

 Guano, amount of, equivalent to farm- 

 yard manure, 285 



and bone-earth, effects of, compared, 

 264 



and farm-y#rd manure, amount of 

 phosphates and nitrogen in, 252 



from Baker and Jarvis islands, 263 



fertilising action of, attributed to its 

 nitrogen or ammonia. 247, 281 



due in many cases to fixed 



constituents, 247 



deficient in potash, 249 



and farm-yard manure, effects of, 

 compared, 249 



when its application will be success- 

 ful, 251 



continued use of, exhausts the soil of 

 silica and potash, 252 



mixed with sulphuric acid and turf 

 or sawdust, 253 



peculiar effects of, illustrated in the 

 Saxon experiments with different crops, 



and salts of ammonia, comparative 

 experiments with, in Bavaria, 285 



Gypsum, 316 



