The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan.

  • Richard Kirwan
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: The manures most advantageously applicable to the various sorts of soils, and the causes of their beneficial effect in each particular instance / By Richard Kirwan. Source: Wellcome Collection.

    78/102 (page 78)
    [ 73 ] amount to 150 grains, the weight of theundif- fblved refiduum fhould in the above cafe be 383—150=235 grains. 12°- Reduce the dried mafs into the fineft powder, throw it into a Florence flafk or glafs V. retort, and pour on it three times its weight of pure oil of vitriol, digeft in a ftrong fand heat, and at laft raife the heat fo as to make the acid boil; afterwards let it evaporate nearly todrynefs: when cold, pour on it gradually fix or eight times its weight of diftilled water, and, after fome hours, pour off* the folution on a filtre; the filtre fhould previoufly be weighed, and its edges foaked in melted tallow the fubftance found on the filtre being weighed (lubftrafting the weight of the filtre) gives the quantity of filicious matter; and this weight fubflraded from that of the dried mafs, gives that of the argill. In this cafe I will fuppofe the filicious mafs to weigh 140 grains, then the argillaceous fhould weigh 95 grains. Then f An ingenious contrivance of Dr- Black.