The works of the Honourable Robert Boyle, Esq., epitomiz'd by Richard Boulton ... ; illustrated with copper plates.

EXPERIMENT IV.

* 1.1 VEnetian Sublimate Distill'd from Cornish Tin, into a good large Receiver, yield∣ed a Spirituous Liquor, which emits white Exhalations, upon an Access of free Air; but if the Orifice of the Vessel be but cover'd with a Piece of Paper,* 1.2 it presently ceases to emit those Exhalations; yet begins again, when that Paper, which lay but lightly upon it before, is taken off: Whence it appears, that the Air may promote the rising of metalline Vapours in the Atmosphere.

And that Metalline Fumes will ascend in the form of Vapours, will appear from the follow∣ing Experiment, viz. Having satiated Aqua fortis with Copper, and steeped some brown Paper in it to soak up some of the Menstruum, when the superfluous Moisture was partly eva∣porated, we laid some of it upon the Hearth, near a Wood Fire, upon which, the Paper be∣ing

Scorched, emitted Fumes like Smoak, which rising up in the Air, as soon as they came to the Flame, they imparted to it a Colour, partly Blew, and partly Green; as it was variously mix'd with the Flame and Smoak of the Wood.

Notes

• * 1.1

  Venetian Sublimate and Cornish Tin.
• * 1.2

  Air pro∣motes the rising of Metalline Vipours.