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Econdly, by mixing two uch liquid Bodies as Petroleum and trong Spirit of Nitre in a certain proportion, and then ditilling them till there remained a dry mas, I obtain'd a brittle ubtance as black as Jet; and whoe Superficies (where it was contiguous to the Retort) was gloie like that Mineral when polihed; and as I expected I found it alo to reemble Jet, in being endowed with an Electrical Faculty.

Hirdly, Having burnt Antimony to ahes, and of thoe ahes, without any addition, made a tranparent Glas, I found, that, when rubb'd, as Electrical Bodies ought to be to excite them, it anwer'd my expectation, by manifeting a not inconiderable Electricity. And this is the worthier of notice, becaue, that as a Vitrum