PREFACE, &c. and enriched cur Language with it, being contented that all cur Lord the King's People (hould be Philofophers. Advertifement concerning the prefent Edition. H Aving for fome Tears obferved a great Demand for Books of this Kind (and for thefe Treatifes in particular) which, by the judicious, are efteemed as good, or better than any on the Subjefi, (and very rare) and finding nothing new publifhed, was induced to the prefent Undertaking; I am informed by a Gentleman of undoubted Credit, that the Sale of Barba’s Book is prohibited in Spain, under the Penalty of the Inquifttion y and is fo fcarce in England, that I am in formed there is but one Copy of the Spanifh Edition, which is in Sir Hans Sloan’j Library ; PlattesV Difcovery is very much efteemed, as being founded upon Experience; Alfo Houghton is valuable for his Laws relating to Mines, and his Explanation of the Miners Terms, &c. Q. Payne..