INDEX. 



413 



LEA 

 Leavrs. romoval of. from turnips, 27 

 Lime alters the condition of tlie soil, 

 349 



— beneficial effect of, 83 



— experiments with, 350 



— action of, on soils, 81 



on a drained marshy soil, 84 



— water, effect of arable soils on, 3ol 

 Lysimeter waters, 92 



analysis of, 363 



MAGNESIA, dispersed in soils by the 

 agency of gypsum, 347 



— influence of, on the formation of 

 nitrogenous compounds in seeds, 258 



— necessary to plants, 257 



Maize, growth of, in solutions of its 

 food, 375 



— in flower, produces seeds if placed 

 in water, 38 



Manure, nature of, 183 



— and tillage, 131 



— change in the classification of, 308 

 Manure, beneficial action of, in restoring 



the relative proportions of mineral 

 matters in soils, 127 



— excessive use of, gives no advantage, 

 213 



— reason of decreasing value of, by 

 system of rotation, 230 



— nitrogen, classification of, 294 



— action of, not always proportional to 

 quantity used, 215 



Manured land, produce o^ in Saxon 

 experiments, 208 



Marine plants, power of selection of 

 food in roots of, 52 



Matricaria chamomilla, ash of, 235 



Maiisegast, unmanured field, produce 

 from, 190 



Mayer, experiments on soils with 

 caustic alkalies, 312 



Meadow grass, effect of sea-salt on, 

 340 



Metals found in plants, 55, 57 



Mineral matters, absorption of, by soils, 

 133 



to be restored, vary in different 



soils, 250 



restored by farm-yard manure, 



227 



lost in crops in the Saxon ex- 

 periments, 232 



restoration of all, necessary, 249 



Minimum, law of, 213, 216 



Monocarpous plants, have distinct pe- 

 riods of gro^vth, 25 



Moss water, analysis of, 372 



'Vj'AEGELI. experiments on nutrition 



IN of plants, 106 



Nile, valley of, reason of its permanent 



fertility, 240 

 Nitrate of ammonia, formation of, 327 

 Nitrate of soda, 334 

 action of, on oartliy plios- 



phates, 79 

 — experiments on cereals with, 



by Bavarian Society, 338 

 Nitric acid in rain water, 289 

 Nitrogen classification of manures, 294 



— esteemed chief agent in manures, 

 293 



— indefinite idea of, in manures, 294 



— assimilable and sparingly assimi- 

 lable, 295 



— amount of in soils, 305 



— amount of, in different layers of 

 soils illustrated in Russian black soil 

 and in Caen soil, 311 



— cause of the inactivity of the great 

 mass of, in soils, 319 



— most abundant in tho upper ten 

 inches of soils, 311 



— in soils and farm-yard manure com- 

 pared as to eflfect, 315 



— profit and loss of, in the Saxon ex- 

 periments, 291 



Nitrogen compoiinds, function of, in 



seeds, 45 



in annuals, 45 



in perennials, 47 



in soils bear no ratio to their 



productive powers, 306 

 supposed different forms of, in 



soils as operative and inoperative, 



307, 309 



— — in soils not distinguished by ac- 

 tion of alkalies, 312 



in farm-yard manure only partly 



separable by distillation with alkalies, 



315 

 in manures and soils, different 



effects of, on what dependent, 316 

 Nitrogenous food, experiments on the 



growth of plants without, 43 

 removed in crops is more than 



fully restored by rain, 292 

 restored to soils by fodder plants, 



329 

 Nitrogenous manures not always the 



most efficacious, 286 

 effects of, not proportional to tho 



nitrogen present, 303 



first effect of, 331 



when required, 329 



Nutritive substaneos, closeness of in 



soils (figure), 195 



