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 petrifying Springs; but that is a fouler Sort: There is in Norway a Pyramid of Spar two Inches long, which was once mine; in which two Branches of the olid Heath Mos, or Lichen, are perfectly embodied.

It has been thought the Spar in Cracks of Rocks was brought from elewhere by Water; or was and is originally in all Water: The latter is the Opinion of Linnæus; Henkell maintains the former. But if either were the Cae, Spar would be ometimes found in vitrecent Rocks, and Crytal in thoe of Limetone; which Obervation denies.

Spar they ay will be formed where Water can be retained; but indeed alo where it cannot; 'tis enough that it ouzes lowly: Nay, not Water alone diolves Spar; but it can be retained in Vapour. I have from Cornwall Incrutations of true Stalavtite, formed in the Pipes of Fire Engines in the Mines, at Heighths to which the Water never acends, by many Feet; but only Vapour.

Mundick is alo thus a Creature of the Air, in many Places. I have trigonal Pyramids of Spar, which hung from the Top of the Bauman's Cave, in the Hartz, covered with Cubic Mundick; there is none in the Spar itelf; and from the particular Circumtances of the Specimen, Water could not have lodged upon it, only Vapour.

Spar is one Thing, of one Weight, one Hardnes, and when pure can never be mitaken for any other Foil. It is liable to have other