Page:Theophrastus - History of Stones - Hill (1774).djvu/291

 A Stone thus formed mut have Qualities very different from all others; And uch this affords on Trial.

There ries from it in Ditillation an Acid, different from the vitriolic, nitrous, or aline.

And alo a olid Sublimation; of a Stone-like Nature; utterly unknown from any other Subtance.

The Proces by which I tried the Subtance was this:

Two Pounds of the green Kind of the Stone were powdered, and put into a Glas Retort;

Two Pounds of Oil of Vitriol were added to this;

And a Quart of Spirit of Wine was put into the Receiver.

No Heat, nor Ebullition. whatoever, followed the Mixture for ome Time; and in the End but little

The Veels were cloed; and kept in a Reverberatory Furnace for fourteen Hours.

The Fire was flow at firt; ele the Matter would have rien over.

No phophorecent Light was viible at any Time.

The Fumes were at ome Times viible, in the Receiver; at others not. Whereas in the marine Acid they are never viible; unles Air be admitted.

They were elatic; and had a Smell like thoe from Spirit of Salt.

The Surface waved, and roe a little; and there was on it an icy, and gelatinous Subtance. The