A discovery of subterranean treasure [electronic resource] : containing useful explorations, concerning all manner of mines and minerals, from the gold to the coal; with plain directions and rules for the finding of them in all kingdoms and countries. In which the art of melting, refining, and assaying of them is plainly declared ... Whereunto is added a real experiment whereby every ignorant man may presently try whether any piece of gold that shall come to his hands be true or counterfeit ... Also a perfect way to try what colour any berry, leaf, flower, stalk, root, fruit, seed, bark or wood will give: with a perfect way to make colours that they shall not stain nor fade like ordinary colours. Very necessary for every one to know, whether he be a traveller by land or by sea, in what country, dominion, or plantation soever he shall either sojourn or inhabit. By Mr. Gabriel Plattes.