Elements of agriculture and vegetation. To which is added, an appendix, for the use of practical farmers / [George Fordyce].

  • Fordyce, George, 1736-1802.
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: Elements of agriculture and vegetation. To which is added, an appendix, for the use of practical farmers / [George Fordyce]. Source: Wellcome Collection.

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    of the two is of greater fpecific Gravity, or if the Particles of the one, are finer than thofe of the other, and both infoluble in Waters if they be mixed with Water, the heavieft, or that whofe Particles are largeft, will fubfide firft, and the Water may be poured off while the other is ftili fwimmiag in it. Example, Clay and Sand may be feparated in this Way; the Clay being finer than the Sand, will remain longer fufpended, and therefore may be poured off with the Water. Secondly, By Dissolving one of them in a Menftruum, in which the other is infoluble : Example, An Acid diffolves calcareous Earth, but not fand; therefore thefe two Subftances may be feparated by pouring upon them an Acid, which diffolvifig th£ calcareous Earth, will leave the Sand. Thirdly, by Filtration ; if the Particles of the one, are finer than thofe of the other, by putting thefti with Water into a Filter, whofe Pores will let the Particles of the one pafs through along with the Water, th,e other re- maining behind. Example, if Sand and Clay be mixed with Water, and poured into a proper Filter, the Clay will pafs through with the Water and leave the fand. Fourthly, By Evaporation, which i$ the converting a Body into Vapour and difiipating it. If