.of Virgin Ores; or in a glimmering, ston-ing, friable State, or in a Mixture of seve-ral different Things with one Metal, orSemi-Metal, the rest being Earth, Spar,Stone, Chirk, and such like ; and whenthey appear intermixed, in what Conditionthey are, and what has the Predominancy:We must also, with the strictest Scrutiny,weigh the several Degrees of Exaltation inthem, their peculiar essential Dignities, andmost remarkable Properties, which we al-ways meet with different, in different Ores,Some denote their Essence by ; heir Colours,by which they may be easily distinguished*because Chymistry maks usacqua n ed withtheir peculiar Appearances, shewing us w faysuch and such a Colour, is peculiar to suchand such a Fossil; some we are to frameour Ideas of, by being interwoven or in-tangled with other Bodies, some being Ho-mogenious, others Heterogenious to them,the former of which always tends to theirPreservation, the latter to their Destruction ;by this Means we shall have as sufficientTestimony, as we can desire of the Matu-ration, Perfection, and Decay of the sub-terraneous Wealth ; but it must be in par-ticular recommended, that every one makesbis 'Collections with the utmost Diligenceand Regularity ; here I apprehend that anObjection will be raised, that this Branchof the Science, called Mineralogy, is ^ a