Page:Theophrastus - History of Stones - Hill (1774).djvu/292

 The upper Part of the Receiver became covered with a thin tony Crut.

The Swedes peak of a Crut of abolute Flint, upon the Surface of the Liquor in the Receiver: But they put Water there: This was the ame Subtance: And it remained fix'd on Part of the Receiver: While Part was diplaced; probably by ome light Vapour from the Spirit of Wine.

The Corroion of the Glas of the Retort eems to be an Effect of that peculiar Sublimation which ries in the Ditillation; nay, and begins to rie, even without that Operation: For watching attentively the Effect of mixing the vitriolic Acid with the Stone, I perceived, that tho' they eemed to meet without any Eervecence, yet by Degrees there appeared a light Commotion; which increaed for a coniderable Time, and, during which, this trange Sublimation of the Flores began to be made; and increaed with it; even before any Fire was ued.

Repeating this Trial, and breaking the Retort afterwards, no Fire at all having been ued, I found it corroded in Waves; where the Flores had adhered to the Neck, and eaten in very deeply, jut at the Surface of the Matter.

The Flores themelves are extremely acrid to the Tate, and are indioluble in any Acid; nor can be run into Glas by any Fire.

The Acid of this Stone in its puret State, o far as I have een it, is about one third heavier than Water.

After even Hours a Hole was eaten thro' the Retort, and Fumes iued: But this was oon cloed