The fineness of silver is different in different coins.
The fineness of the Dutch silver is various, according to the species. I shall here, for the greater distinctness, take notice only of the fineness of the florins; because it is the best and the most standard coin, used in the payments of foreign bills of exchange, leaving the other varieties of their specie to be considered afterwards.
Florins are 11⁄12 fine with one grain of remedy.
By florins I mean (besides the florin pieces) those also of 30 stivers, and the 3 florin pieces, the standard of which is all the same, to wit, 11⁄12 fine with one grain of remedy.
How they reckon their silver standard.
The mass of silver in the Dutch mint, (when we speak of the fineness) is supposed to be divided into 12 pence, and every penny into 24 grains, as in France.
Any mass of silver, therefore, of whatever weight, is supposed to be divided into 288 parts; consequently by 11⁄12 fine with one grain of remedy, is meant, that there are 263 of these parts fine, and the remaining 25 parts of alloy. This is the exact standard of the Dutch florins.
To find therefore the number of grains of fine silver in the marc weight, as it is delivered at the mint, we must state this proportion, 288 : 263 :: 5087 : 4645.4.
Exact quantity of fine silver in a marc weight of Dutch florins as they come from the mint.
The marc therefore of coined silver florins, after all deductions for alloy, and for remedies of weight and of fineness, contains of fine silver 4645.4 aces Hollands troes.