A Parcel of NATURAL SAL ARMONIAC. (Rather Ammoniac, from its supposed similitude to that of the Ancients, bred under the Sands in Africa.) This I call Natural, as being found sublimed, by the subterraneal Fire, in a Cole-Mine near New-Castle upon Tyne. Given by Dr. L. Hodgson, who first made experiment of the nature hereof. And hath answer'd several Quæries about it, proposed by Mr. Boyle. (a) (a) See Phil. Trans. N. 130. Here is some of it lying upon and between Beds of a light and sooty Earth; and some pure and white as Sow. It hath the perfect Tast of the Factitious; consisteth of the like Fibers or Styriæ; and may be easily sublimed into Flowers. (b) (b) See Part 4. Cerutus hath also describ'd a Sal Ammoniac, as he calls it, sublimed by the subterraneal Fires of Puteoli; but This is of a different kind, as appears from his Description of it. (c) (c) Mus. Calceol. S. 2. p. 149. Hereof are made several Preparations of great Use to Physitians, Alchymists, and others, as the Spirit Simple, Aromatiz'd, and Tinctur'd; the Tinctur'd Flowers, &c.

SAL AMMONIAC sublim'd in a Sugar-Mould from Beds of the same taken from a Coal-Mine near New-Castle upon Tyne; of which, see the foregoing part of this Catalogue. Prepar'd and given by Dr. Luke Hodgson.

SPIRIT of Sal Ammoniac distill'd from the said Salt mixed with Quick-Lime. By the same Hand.