FOOTNOTES:
[1] See Priestly's Experiments and Observations on different kinds of Air, begun in 1767.
[2] Recherches chemiques sur la vegetation, chap. ii.
[3] This was a discovery of Sennebier.
[4] It is by a knowledge of this fact, that gardeners bleach chicony and cellery, &c.
[5] See Fourcroy, vol. viii.
[6] See Chaptal on vegetation.
[7] Knight's Observations, &c.
[8] Davy's Elements.
[9] Vegetable ashes are lime, combined with an earthy saline matter.