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to expatiate on this Subject, and point out,in what Manner they are to be done.

, Seventhly, He that presumes to take inHand the Direction of a Mine, rpust alsobe a perfect Master of subterraneous Geo-metry, or the Method of Dialling, that he,may measure Shafts, Contrive Levels, &c.,f§c. to the best Advantage, that he maybe able to come at the Ore as deep as pos-sible. This Art, however, is pretty wellknown stere 5 nor do those a little Glory,themselves upon it that are Masters of it;which,- though ; i allow to be of great Useand Service, yet such great Stress is not tobe . laist upon it, as some of our reigningStewards would make appear, and toomuch dver-rate themselves upon.; for sub-terranean Geometry is to Miners, what La-titude is to fea-Faring People; whereas sub-terranean Geography is to our Art, whatLongitude would be, was it discovered, tothat of Navigation; or, the Parallel maybe more strictly and plainly drawn, betwixtthe Geometrician and Anatomist ; the oneonly knowing the Distance and Dimensionson and within the Place he is surveying,whilst the,other comprehends not only that,but all the inward Parts of the humanBody he is handling.

Eighthly , A Mine Student must also notforget to make himself Master of removingand expelling the stagnating vitiated Air

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