2051.5 Gabriel PLATTES. A discovery of subterranean treasure: viz. of all manner of mines and minerals, from the gold to the coal; with... rules for the finding of them... And also, the art of melting... and assaying of them is plainly shewn... Whereunto is added a real experiment whereby everyonemay... try whether any piece of gold... be true or counterfeit... Also a perfect way to try what colour any berry, leaf... bark, or wood will give... 12° London 1738 Ferguson