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manure, for its supply, is more abundant, by which it is fittedto bear valuable crops, and yield better grass in its turn. Thisjudicious system is very prevalent; and whoever blindly departsfrom it, without having the command of adventitious manurefrom organized matter, foolishly labours to bis own loss, Whenthe value of the crop does not exceed that of labour, seed, rent,&x. both the owner and the public suffer loss, at least, equal towhat the same ground would have yielded in pasture: and who-ever continues, injudiciously, to labour land, for a crop to whichsufficient feeding manure has not beer, administered, to give ra-tional expectation of a profitable one, not only hurts his own in-terest, but is the enemy of society. The effectual demand ar,dmoney price of the produce of the dairy and the shambles, is notless than that for corn. The soil cannot produce advantageouscrops of corn, without being duly stored with vegetable pabu-lum, which can only be administered to a certain proportion ofthe whole :—What is so treated, is qualified to produce more andbetter grass;—continued repetitions of animal and vegetablesubstances macerated in putrid water, and still imperfectly fer-mented, separate the parts of dense, and fill the interstices ofporous soils ;—and, in short, it appears that by the system ofconvertible husbandry, accommodated to circumstances, and bytliis system only, the general fertility of the country may be pre-served and improved.
Chap. XII. Apr. Faiit 4. No. 2.
Plan tor ascertaining tiie effects of the differentSorts of Manures in promoting Vegetation .
By George Fordtce, M. D.
It is known from experiment, that plants will grow in sand andclay, with the addition of distilled water and atmospheric air;and that after the plant has grown, if it be taken out by the rootsperfectly clean, that the sand and clay are exactly in the samequantity as before the vegetation of the plant.
The whole of the nourishment of the plant, growing thus inpure sand and clay, is therefore taken from the water, or theatmospheric air.
It is farther ascertained by experiment, that, certain substancesbeing added to the sand and clay, the plant will grow more lux-uriantly in all its parts, than if it had grown in sand and clayalone ; the water and the atmospheric air being the same.
Substances which, when added to sand and clay, occasion aplant to grow more luxuriantly in all or any of its parts, are call-ed Manures .
Plants consist of roots, herbaceous steins and leaves, flowers,