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 We find hollow Crytals, and we have hollow Pyramids of Spar; but 'tis a rah Thought, tho' of a great Man, to imagine that a Crytal of Salt was firt formed in thee Caes; and when the tony Coat was finihed over, it melted away again: This is Imagination: But there is not a hollow Stalactite that may not hew the Senes, and convince the Reaon, that this Shell of Spar, or Crytal, may be formed without a olid Nucleus.

There are no entire Rocks of Spar; and they who thought they had een uch of Crytal, perhaps mitook pure Ice for them. Both Spar and Crytal rife in general from foul Stones; and they who thought Ice grew to them in Time, were carce more pardonable than uch as took Ice for them. Scheukzer has een the Difficulty of accounting for their Forms, and joined the Lamentation of Philoophers upon that Subject; for the Salt Sytem was not then in being: But the old Pliny has not only lamented this Difficulty, but aigned its Caue; and this a Caue to overthrow that Sytem utterly: It is, that tho' the Figures be all regular, they are not all alike; or all reolvable into the ame Laws.

'Tis an invidious Office, and unpleaing, to dwell upon the Errors of thoe who wrote before; but thee are o received, and o etablihed, that there is no other Way to Truth.

Wallerius ays, that Spar is compoed of rhombic and pyramidal Particles: And fore