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evident, were but the known and unerringLaws of the Art once reduced into a syste-matical Order; which in this might be asregularly done as in any other Sciencewhatsoever; particularly as I know of none,in which greater Lights have been obtained,than in this : In. regard to what I havehere advanced concerning this Science, andtowards framing its Principles into a System,I would not here be thought to mean aspeculative hypothetical Theory ; but suchan one as is founded upon invariable and un-doubted Axioms , which are capable of be-ing ranged and placed in an exact Order,and so methodized, that one thing shall bethe necessary Result of another; the wholeevidently and manifestly established and con-ducted by Experiments, and laid down andexplained in such a clear Manner, that itmay be comprehended by any commongood natural Capacity ; for it ought to beadapted to the Literature of the Miner andSmelter ; and, if this is not done, it is tobe apprehended, that all other Attemptswill be rendered abortive, and the Art re-main as distant, and as far elongated fromPerfection, as it is at this Instant.

It may, perhaps, be inferred, from what Ihere propose, th at I would have every Minerand Smelter compleat in the Knowledge ofevery thing I have laid down, before Ilook upon him capable of having any Em-ployment