Fleta minor the laws of art and nature, in knowing, judging, assaying, fining, refining and inlarging the bodies of confin'd metals : in two parts : the first contains assays of Lazarus Erckern, chief prover, or assay-master general of the empire of Germany, in V. books, orinally written by him in the Teutonick language and now translated into English ; the second contains essays on metallick words, as a dictionary to many pleasing discourses, by Sir John Pettus ... ; illustrated with 44 sculptures.

CHAP. XI. How poor Oars of Silver are to be Assayed.

[Section▪ 1] AS for poor and unclean silver Oars which are mingled with stones (and yet may be wash'd off with water) Assay them thus; stamp and grind them in an Iron Morter very fine (like flower) mingle all well to∣gether; and weigh 28 Centners of it with the Assay weights, then put it into a smooth Tub, wash it with water till it remain like a fine slick or Clay, then weigh this wet slick and you will find how much those Oars do weigh and afford of clean slick, in one Center (because the slicks that are made clean by washing are also weiged vvet) try it upon silver (as you have been taught above) after such a Proof you may make your Accounts: and if by preparing and vvorking thus you can subsist: such a Proof hath preserved many an Assayer from danger of loss.