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

EXPERIEMINT XLII.

* 1.1HAving fill'd the third part of a Long-neck Viol, with ten Sprigs of Coral, and as much Spirit of Vinegar, as swam about an Inch over them, we plac'd it in our Receiver; and tho' at the first there appear'd but very few Bubbles, yet upon a few Exsuctions of the Air, they rose so plentifully, as to make the Menstruum appear white, the whole continuing to boil and fer∣ment, as in a Seething-pot, as much Froth stand∣ing upon the Liquor, as answer'd the Depth of it, in the Viol: Yet upon letting in the Air, the Froth presently disappear'd, and the Liquor be∣came transparent again. And these Phaenomena successively follow'd each other, no less than five times, as the Air was drawn out, or let in again; and the Ebullition in those Tryals, upon the drawing out of the Air, was so great sometimes, as to run over the Top of the Glass; and that those numerous Bubbles might not be suspected to arise from the Spirit it self, we clear'd it of those, before the Coral was put in, but the same

Phaenomena, still succeeded: nor was there any considerable Difference, when the Tryal was made with Powder of Coral, except that the Li∣quor was obscur'd by several Parts of it carry'd up along with the Bubbles. But one thing in the Foregoing Experiments, was remarkable, That tho' the Ebullition was so violent, yet the Viol immediately taken out of the Receiver, did not affect our Hands with the least sensible Heat.

Notes

• * 1.1

  The diffe∣rent Opera∣tions of Cor∣rosives in, and with∣out our Re∣ceiver.