from credible Witnefles, yet I forbear to mention, and not to overburden the Belief the Reader. Over-againft this wonderful Vein of Land, on the other Side of the Valley of Oroncota, Hands that famous Piece of Land they call Pucara-, which figmfies in their Language Fortrefs, it is a Place the beft fortify’d by Nature of any now known >n the World, being fituate very high, feven Leagues in Compafs, and all furraunded with high and inacceffibleHills, only on the one Side there is a fmall Avenue after having paft a very difficult Afcent. In it’s fpadous Fields, on the Top, there be many fine Brooks of V/ater, Wood, Pafture-ground, Commons, and Waftes, very commodious for the Sup port of Human Life. CHAP. XV.III. Of the Generation of Metals. I I' is no Wonder, that learned Men differ fo much in their Opinions, about the Mat ter whereof Metals are cogcndred, becaufethe Author.of Nature feems to have created them m that Obfcurity, and Depth, and to have immur’d them with hard Rocks on Purpofe to hide their Caufes, and to give Check to the Ambition of Man. 1 he Philofophers, who pretend to know the Caufes of Things, befidcs the firft Matter, which