Page:Theophrastus - History of Stones - Hill (1774).djvu/315

 If we can ever bring Spar, after Solution, to recrytallize, as Salt; we hall ee all Things explained in this Particular. 'Tis what I have tried four Years, with poor Succes; and I have now, requeted the ablet Chymit that we have, to join with me in the Attempt. What may arie under his experienced Hand, I know not: All I have found is, that the wifter the Fluid is evaporated, the coarer is the Matter left behind; and the more Length of Time is given, the nearer it approaches to a Promie of Crytals.

I think when this hall be accomplihed, we hall find all Spar to be but one Thing; differing only according to the other Matters mixed with it. 'Tis aid, the Selenite powdered and mixt in Water affords Crytals; and Kabler gives the Authority of an eminent Metallurgit for it: With me neither has this ucceeded yet; But I have no Depair; and tho' it never hould ucceed with me, it may with others: When that is een, the other, more important as it is, need not be uppoed impoible.

Nothing is more familiar than the Production of what it is the Cutom to call, Selenitical Salts; Urine affords them; and ome Preparations of Sulphur; but to recrytalize Selenite is, to produce, from a clear Fluid, pellucid dodecahacedral Rhombs, flexile, not elatic, and not oluble again in Water: And he who hall effect this, need not depair of recrytalizing alo Spar. The