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(i page 229.) For the fake of brevity, I mention /ime only in the text; but the fame obfervations will apply to any other cal- careous matter, of equal purity, that can be obtained: of thefe fhelly fand, and fhell. marle, are the moft eafily divifible, and, where free from extraneous mixtures, are nearly equal in value to lime. Chalk is a pure calcareous matter; but is not fo eafily di- vifible; and clay marle is often impure, fo as to require to be em ployed in very /arge quantities to produce a fenfible effect. All thefe fubftances operate nearly in the fame manner.

(4, page 244.) Perhaps turnips can be reared to a larger fize on clayey lands than any other, if merely the rearing them to a greater fize were to be adverted to; of which the following well authenticated fact will afford a fufficient proof. Mr. Campbell of Shawfield occupies a farm at Woodhall, near Glafgow, confifting of a{trong clayey foil, upon which he had fome turnips laft feafon (crop 1795,) of a.fize that attracted the notice of every perfon who faw them. One day an argument having arifen among the gentlemen at table, about the greateft weight to which a turnip could be raifed, and opinions varying very much on this fubjedt, Mr. Campbell ordered one of the largeft of his turnips to be pulled and weighed. This was done; and moft part of the company were very much furprifed on finding that it weig xed full forty pounds. On fearching, however, with great care, through the field at a fu- ture period, when they had attained a greater growth, one turnip was found which, when perfectly cleaned from earth and rubbith of any fort, weighed Sixty THREE POUNDS AND A HALF. This turnip was kept for fome time, and repeatedly weighed be- fore different perfons; among the laft of whom was the Duke of Argyle, who faw it weighed fome weeks after it had been taken up, when it was found to have loft juft half a pound; it weighing then no more than fixty-three pounds neat. Many perfons are

now alive who faw this turnip weighed, and can correct me, if I