By aquafortis, by clipping, and by filing.

Filing and clipping he employed in reducing all kinds of coin, whether gold or silver; but aquafortis he used merely in reducing gold coin, whether guineas, jacobuses, or Portugal pieces, otherwise called moidores, which were at one time as current as guineas.

By laying a guinea in aquafortis for twelve hours he could filch from it to the value of ninepence, and by letting it remain there for twenty-four, to the value of eighteenpence, the aquafortis eating the gold away, and leaving it like a sediment in the vessel.

He was generally satisfied with taking the value of ninepence from a guinea, of eighteenpence from a jacobus or moidore, or half-a-crown from a broad Spanish piece, whether he reduced them by aquafortis, filing, or clipping.

From a five-shilling piece, which is called a bull in Latin, because it is round like a bull's head, he would file or clip to the value of fivepence, and from lesser coin in proportion.