Page:Theophrastus - History of Stones - Hill (1774).djvu/306

 An Intance of this Coure of Nature appears in the philoophic Hitory of Spar.

1. The Primitives, as we have een, are Water, Bitumen, Chalk, Clay, Talc, and Mineral Acid: To thee the Operations of the Air, and Fire give great Powers of acting. We thus find

2. Heavy Vapours, formed of Air, and much Water. Thee, pervading all Things,

3. Meet the Mineral Acid, and uniting with it; if they run clear to the Surface, afford Medicinal Springs; but

4. Thus united, they may fall upon Bitumen: This is no where more frequent than in Limetone Rocks; and often tands in Puddles, in their natural Hollows.

5. By this Mixture, uniting in its Coure, is formed a real, tho' a fluid Sulphur: For Sulphur is nothing ele; nor can be formed by any other Mean.

6. This Sulphur, not yet conereted, paes in its liquid Form thro' the Pores of the tone;