384: 



INDEX. 



Gypsum, experiments on clover, 320 

 action of ar 



325 



arable soil on BO!U lions of, 



effects the distribution of potash, and 

 magnesia in soils, 327 



Horse-chestnut, analysis of ash of leaves 

 of, 335 



Human excrements, value of, as manure, 

 illustrated at Rastadt, 259 



price of, 259 



not injured by deodorising by sul- 

 phate of iron, 261 



Ignorant practical men, 239 



Iodine, different amount in different 

 plants, 69 



Iron necessary for plants, 68 



Irrigation, mineral matters supplied in, 

 374 



water, suspended mud of, most valu- 

 able, 375 



Japanese husbandry, 362 



dispenses with cattle feeding, 364 



soil, 361 



supply of manure, 365 



mode of constructing privies, 365 



mode of preparing excrements and 

 compost for application in field, 366 



system of manuring, only one of top- 

 dressing, 367 



system of planting in rows, 367, 372 



husbandry compared with European, 

 369 



tillage of the soil, 370 



succession of plants illustrated, 373 

 Jerusalem artichokes, effect of the cul- 

 tivation of, on arable soil, 215 



Knop; experiments of, on growth of 



plants in solutions of their food, 350 

 Kolbe, formation of nitrous acid, 309 

 Kotitz, vmmanured field produce from, 



186 

 Kroker, estimation of nitrogen in soils, 



290 



analysis of drainage water, 342 

 Kuhlmann, experiments with salts of 



ammonia, 288, 317 



sea salt, 317 



lime, 330 



Large crops indicate the available con- 

 dition of the mineral food, 190 



depend on the closeness*of the nu- 

 tritive substances in the soil (figure), 

 190 



Lawes and Gilbert on clover sickness, 

 157 



Lawes and Gilbert on reason of the fail- 

 ure of the experiments of, 159 



Leaves, principal conditions for the for- 

 mation of, 226 



removal of, from turnips, 42 



Lime alters the condition of the soil, 329 



beneficial effect of, 92 



experiments with, 329 



action of, on soils, 90 



on a drained marshy soil, 92 



water, effect of arable soils on, 331 

 Lysimeter waters, 99 



analysis of, 363 



M 



Magnesia, dispersed in soils by the agency 

 of gypsum, 327 



influence of, on the formation of nitro- 

 genous compounds in seeds, 247 



necessary to plants, 246 



Maize, growth of, in solutions of its 

 food, 375 



in flower, produces seeds if placed in 

 water, 52 



Manure, nature of, 180 



and tillage, 134 



change in the classification of, 292 



beneficial action of, in restoring the 

 relative proportions of mineral matters 

 in soils, 130 



excessive use of, gives no advantage, 

 207 



reason of decreasing value of, by sys- 

 tem of rotation, 222 



nitrogen, classification of, 279 



action of, not always proportional to 

 quantity used, 209 



Manured land, produce of, in Saxon ex- 

 periments, 203 



Marine plants, power of selection of food 

 in roots of, 64 



Matricaria chamomilla, ash of, 227 



Maiisegast, unmanured field, produce 

 from, 186 



Mayer, experiments on soils with caustic 

 alkalies, 295 



Meadow grass, effect of sea-salt on, 321 



Metals found in plants, 67, 68 



Mineral matters, absorption of, by soils, 

 126 



to be restored, vary in different 



soils, 239 



restored by farm-yard manure, 219 



lost in crops in the Saxon experi- 

 ments, 224 



restoration of all, necessary, 239 



Minimum, law of, 207, 210 



Monocarpous plants, have distinct pe- 

 riods of growth, 40 



Moss water, analysis of, 372 



N 



Naegeli, experiments on nutrition of 



plants, 112 

 Nile, valley of, reason of its permanent 



fertility, 236 



