Mettals are very necessary for many Uses, and are to be reckon'd among the Fruits and Manufactories of the World. And of these, Gold and Silver being by nature very fine, and more scarce than others, are higher prized; and a little of them is very reasonably esteem'd equal in value with a great quantity of other Mettals, etc. For which reason, and moreover that they are imperishable, as well as convenient for easie stowage and removal, and not from any Laws, they are made a Standard, or common Measure to deal with; and all Mankind concure in it, as every one knows, therefore I need not enlarge further in this matter.