{0 ad

AS AMANURE.” 565

upon it, nor has any chance of being dif- folved by the action of the air afterwards, it never can be made to produce its full influence on the foil; and therefore this mode of applying calcareous matter is the moft uneconomical that could ever be practifed.

§ 40. APHO#TS MAT.

Calcareous matter, alone, is not capable of rearing plants to perfectign: mould is neceflary to be mixed with it, in certain proportions before it can form a pro- per foil.—It remains, however, to be determined, what is the due proportion of thefe ingredients for forming a proper foil,

©“¢ is

We know, that neither chalk, nor marle,

nor lime, can be made to nourifh plants|

alone;—and foils are fometimes found,

that. naturally abound with the two firft of thefe to a faulty degree.—But the pro- portion of calcareous matter in thefe is fo much Jarger than could. ever be pro- duced by art, where the foil was naturally deftitute of thefe fubftances,, that there

feems to be’ no danger of erring on that

fide. Probably, it would be much eafier O02 to rw