The merchants map of commerce wherein the universal manner and matter relating to trade and merchandize are fully treated of, the standard and current coins of most princes and republicks observ'd, the real and imaginary coins of accounts and exchanges express'd, the natural products and artificial commodities and manufactures for transportation declar'd, the weights and measures of all eminent cities and towns of traffick in the universe, collected one into another, and all reduc'd to the meridian of commerce practis'd in the famous city of London / by Lewis Roberts, merchant.

CHAP. CCCLXII. Of the Exchanges of Genoa with Placentia.

* 1.1GEnoa doth Exchange with Placentia, and giveth posito Sol. 87¾ current money, to have there 1 Crow. of Mark. I would know then, for Livers 10269. 19. 3 d. current money, how many Crow. of Mark I shall have in Placentia?

* 1.2First then multiply the said Sol. 87¾ by 4, to bring them into 4/4, adding the ••/4, and they make 351 quarters; and then multiply the said sum of Livers by 20, to make them Sols, and then by 4, to make them quarters of Sols, adding to the multiplication ¼ for the 3 Deniers, and it will be in all 821 597, which divide by 331 the price of the Crown of Mark and the division will be 2340, multiplying the rest by 20 and by 12 to make them Sols and Deniers, and they will be in all Crow. 2340. 14. 7. of Gold of Mark, which you must have in Placentia, as by Example will be more evident: 〈 math 〉〈 math 〉

To prove this account, you must multiply the said Crowns of Mark by Lib. 4. 7. 9. beginning to multiply by the Deniers, and then by Sols, calculating it by 12 Deniers for one Sol, and by 2•• for one Liver, and of the product will come l. 10269-18-11. so that it is evident, that the account is just, the difference being in some small parts of the division which is lost, as by Example: 〈 math 〉〈 math 〉

* 1.3At Genoa it is oftentimes seen that the Exchange is made for Placentia in Sols of Money of Gold, and the difference of this money is, that the Crown of Gold, by decree of the estate, is worth Sols money of Gold, and in current money 90 Sols, and though that the said price of the current money rise and fall, the money of Gold, never varieth from the said price of 68 Sol. If then I would know for Livers 2816. 13. 4. money of Gold, which one exchangeth at 66 5 d. money of Gold per Crown, how many Crowns of mark, shall one have? Do thus: Reduce the abovesaid Livers into Deniers, multiplying them by 20, and the Sols resting by 12; likewise reduce the said Sols 66. 5 Deniers, into Deniers, multiplying them by 12, and that which will come thereof shall be the Divisor of the sum of Deniers, come of the said Liv. the which divided, will be 848 Cro. 3. 7. of Mark. 〈 math 〉〈 math 〉

* 1.4To prove this Rule, multiply this by 5 d. and the product will be 2186. 13. 3. which shews the account to be just cast.

* 1.5In Genoa I would deliver for Placentia lib. 3248. 15. of current money, which is exchanged at 67 Sol. 10 d. of money of Gold, I demand how many Crowns of Mark they will be? First re∣duce the said sum of Livers of current money, into Livers of money of Gold, dividing the same by 90 Sols, the price of the Crown of Gold in current money, and they will be Crowns 721. 18. 10, which must be multiplyed by 3 l. 8 s. the price of the Crown in money of Gold, and it will come to lib. 2454. 12. money of Gold, which divided by 67. 10, to see what the Crowns of Mark are worth, and they will make Crowns 723. 14. 3. of Mark, and so much shall Genoa have medit in Placentia for the said l. 3248. 15 of current money, as the example shall more evi∣dently demonstrate: 〈 math 〉〈 math 〉

* 1.6If in Genoa you would reduce any sum of current money, into Livers of money of Gold by a short rule, because that the Crow. of Gold in current money is 90 s. and in money of Gold 68 s. you must take of the current money twice ⅓ placing them the one under the other, and out of

one of the said ⅓ take ⅕, and of that which cometh of the said ⅕ you must take ⅓, and adding these 4 parcels together, will come Money of Gold, as will appear by this Example: 〈 math 〉〈 math 〉

* 1.7For proof of the said account, if by the same method you would reduce Livers of Money of Gold into Livers of current Money, you must add to the said Livers of Money of Gold the ¼, and of that which will come thereof, take 1/17, adding the said two parcels together, and they will make Livers of current Money: Example: 〈 math 〉〈 math 〉

And thus much shall serve for the Exchange of Genoa with Placentia; wherein I have thought fit thus far to enlarge my self by reason of the great Exchanges continually practised between the said two places.

Notes

• * 1.1

  Exchange of Genoa with Placentia.
• * 1.2

  1. Example.
• * 1.3

  Another Ex∣ample of the said Ex∣changes.
• * 1.4

  Proof.
• * 1.5

  Third Exam∣ple.
• * 1.6

  To reduce Li∣vers of cur∣rent money into Livers of Gold in Geona.
• * 1.7

  Proof.