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A Stone thus formed muſt have Qualities very different from all others; And ſuch this affords on Trial.
There riſes from it in Diſtillation an Acid, different from the vitriolic, nitrous, or ſaline.
And alſo a ſolid Sublimation; of a Stone-like Nature; utterly unknown from any other Subſtance.
The Proceſs by which I tried the Subſtance was this:
Two Pounds of the green Kind of the Stone were powdered, and put into a Glaſs 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. whatſoever, followed the Mixture for ſome Time; and in the End but little
The Veſſels were cloſed; and kept in a Reverberatory Furnace for fourteen Hours.
The Fire was flow at firſt; elſe the Matter would have riſen over.
No phoſphoreſcent Light was viſible at any Time.
The Fumes were at ſome Times viſible, in the Receiver; at others not. Whereas in the marine Acid they are never viſible; unleſs Air be admitted.
They were elaſtic; and had a Smell like thoſe from Spirit of Salt.
The Surface waved, and roſe a little; and there was on it an icy, and gelatinous Subſtance.
The
