Copy 1

Georgical essays / [by Alexander Hunter and others; edited by A.H.

  • Alexander Hunter
Date:
1777
Catalogue details

Licence: Public Domain Mark

Credit: Georgical essays / [by Alexander Hunter and others; edited by A.H. Source: Wellcome Collection.

    27/560 page 17
    L a72] ftrange. Nothing, however, is more demon- ftrable. COME Eg The leguminous and farinaceous plants keep their placenta, or feminal leaves, within the earth; in which fituation they fupply the tender germ with oily nutriment, until its roots are grown fufficiently ftrong to penetrate the foil.— The curious reader will find this fubject treat- ed of at large in the third effay. : It is ufual to talk of the falts of the earth; but chymiftry has not been able to difcover any falts in land which has not been, manured, though oil may be readily obtained from every foil, the very fandy ones excepted. Marl, though 4 rich manute, has no falts, It is thought to contain a {mall portion of olea- ginous matter, and an abforbent earth, of a na- ture fimilar to limeftone, with a large quantity — of clay intermixed. Lime mixed with clay comes neareft to the nature of marl of any factitious body that we know of, and may be ufed as fuch, where it can be had without much expence. By increa- fing the qhantity of clay, it will make an excel- B Jent
    digitised image 1
    digitised image 2
    digitised image 3