Compost, in agriculture, is a certain mixture designed to promote vegetation, instead of dung. To effect this purpose, various experiments have been made, of which we shall mention the following.

An oil-compost was invented by the ingenious Dr. Hunter, author of the Georgical Essays, who di-rects 12 lbs. of North American pot-ash to be broken into small pieces, and dissolved in four gallons of water. This mixture is to stand 48 hours, when 14 gallons of coarse train-oil should be added. In a few days the alkaline salt will be liquefied, and the whole, when stirred, become nearly uniform. Thus prepared, it should be poured on 14 bushels of sand, or 20 of dry mould, and the whole turned frequently over, for about six months, at which time it will be fit for use. When these ingredients are mixed with one or two hogsheads of water, they will form a fluid compost, to be used with a water-cart. The inventor himself, however, acknowledges that it is much inferior to rotten dung; yet, from various experiments, it ap-pears to be a tolerable substitute for that article.

A compost prepared from putri-fied animal substances will, doubtless, be preferable to any other manure : the only obstacle to their being

Wing more generally employed, is the difficulty with which they are procured. The following is recommended by Dr. Hunter, of York : Take a sufficient quantity of saw-dust, and incorporate it with the blood and offal of a slaughter-bouse, putting a layer of each, till it becomes a moist and fetid composition. Two loads of this compost, mixed with three of earth, will be sufficient for an acre of wheat or spring corn, and should be laid on the soil at the time of sowing, and harrowed in with the grain. As it lies in a small compass, it is well calculated for the use of those farmers who are obliged to carry their manure from a distance. Hence we recommend this preparation as a substitute, both for fold-yard and stable-dung, because it is extremely rich, and exerts its fertilizing influence longer on the soil; which, however impoverished, will thus be restored to its pristine vigour.—• See also Manure.

Compost, in gardening, is a mixture of various earths, earthy substances, and dung, either for meliorating the soil of a garden, in general, or promoting the vegetation of some particular plant. There are few vegetables which do not delight in some peculiar earth, where they thrive better than in others. - As the reader will find this subject discussed in the alphabetical order of plants, or under the different botanical articles, it would be superfluous to enlarge upon it in this place.