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particularly described by Mr. Swedenborg,in his Regno Subterraneo.

5th/y> As the mineral Veins of oneCountry differ from those of another ; forinstance sake, I will mention two of themost material ones: Veins on the Conti-nent are in long Ranges and Rakes; theyare not there liable to Bars or Out-cuts;they therefore most commonly run prettystreight and certain, for as many Miles asthe Course of the Mountains will admitof ; they are intirely unacquainted withBeds and Bellies in their Mines, which aremost commonly called pipe-works : So, onthe contrary, in all Islands, the Ranges orRakes are seldom found to fun in streightLines; their Veins are very uncertain,seldom continue long ; they are frequentlyimpeded with Bars or Out-cuts of theRocks, and the Ore is too often found inBellies and Pipe-works ; in fine, they havescarce any thing alike or common withthose on the Continent, except the Under-sets, which are generally the fame in mostPlaces: The fame Uncertainty and Irre-gularity holds good, and extends itself evento the very Rocks and Mountains, which,in this Country are different, indifferentCounties ; those in Flintshire are most com-monly soft, those in Montgomeryjhire arehard, and those in Cardiganjhire , are in norespect: like those of either Place ; these

Differences