Page:Theophrastus - History of Stones - Hill (1774).djvu/320

 We ee the Way Art imitates it bet, is by the Crytals of a Liquor in which Lime and Sulphur have been boiled. Sulphur is thus dicloed on the calcining of Spar; and for the other Ingredient, Lime, we cannot be at a Los; ince it has been oberved, no Spar is ever produced in Cracks of any Rocks, except thoe of Limetone: Nay, and what may trengthen this Opinion, the Lime of Spar is weaker than that of Limetone, which a little Sulphur may caue. All this, is but Conjecture; and is delivered as uch, and no other; but yet it rets on the Tetimonies of the Senes; not on the Flights of the Imagination: And it is by Conjecture, in thee dark and difficult Reearches, we mut arrive at Truth.

I claim no better Authority for many of the particular Obervations here, than for this general one; they are indeed all founded on Examination, and Experiments, now made on the Occaion; but they are Examinations and Experiments made only on the Bodies in my own canty Store: I invite, I ollicit, and intreat with my bet Earnetnes, others to repeat them on their own. If they anwer as in mine, the Doctrines are etablihed; if they differ, there is no one in the World to whom that Truth will be more welcome than to myelf. To equivocate about an Error, is pitiful: to attempt to jutify it, is diingenuous: No Man hould be ahamed of etting right his own Mitakes (epecially in Matters