The merchants mappe of commerce wherein, the universall manner and matter of trade, is compendiously handled. The standerd and currant coines of sundry princes, observed. The reall and imaginary coines of accompts and exchanges, expressed. The naturall and artificiall commodities of all countries for transportation declared. The weights and measures of all eminent cities and tovvnes of traffique, collected and reduced one into another; and all to the meridian of commerce practised in the famous citie of London. By Lewes Roberts, merchant. Necessary for all such as shall be imployed in the publique affaires of princes in forreigne parts; for all gentlemen and others that travell abroad for delight or pleasure, and for all merchants or their factors that exercise the art of merchandizing in any part of the habitable world.

CHAP. CCCLXII.

Of the Exchange of Genoa with Placentia.

GEnoa doth exchange with Placentia, and giveth posito Sol. 87¼ current Money, to have there 1 Crow. of Marc. I would * 1.1 know then, for Livers 10269. 19. 3 d. current Money, how many Crow. of Marc. I shall have in Placentia?

First then multiply the said Sol 87¾ by 4, to bring them into 4/4, * 1.2 adding the▪ and they make 351 quarters, and then multiply the said summe of Livers by 20, to make them Sols, and then by 4, to make them quarters of Sols, adding to the multiplication 〈◊〉〈◊〉 for the 3 Deniers, and it will be in all 821597 which divide by 351 the price of the Crowne of Marc. and the division will bee 2340, mul∣tiplying the rest by 20 and by 1•…•… to make them Sols and Deniers, and they will be in all Crow. 2340. 14. 7. of Gold of Marc. which you must have in Placentia, as by Example will be more evident. 〈 math 〉〈 math 〉

To prove this account, you must multiply the said crownes of Marc. 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 20 for one Liver, and of the product will come li. 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 〉

At Genoa it is oftentimes seene that the Exchange is made for Placentia in Sols of money of Gold, and the difference of this money is, that the Crowne of Gold, by decree of the estate is worth 68 Sol. money of Gold, and in current money 90 Sol, 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 li∣vers 2816. 13. 4. money of gold, which one exchangeth at 66. 5d. money * 1.3 of gold per Crrwne, how many Crownes of marc. shall one have, doe thus: reduce the abovesaid liv. into Deners, multiplying them by 20, and the Sols resting by 12, likewise reduce the said Sol 66. 5 De∣niers into Deniers multiplying them by 12, and that which will come thereof shall be the Divisor of the summe of Deniers, come of the said liv. the which divided, will be 848 Cro. 3. 7 of Marc. 〈 math 〉〈 math 〉

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

In Genoa I would deliver for Placentia lib. 3248. 15. of current * 1.5 money which is Exchanged at 67 Sol. 10 d. of money of Gold, I de∣mand how many Crownes of Mark they will be, first reduce the said summe of Livers of current money, into Livers of money of Gold, dividing the same by 90 Sols, the price of the crowne of Gold in current money, and they will be crownes 721. 18. 10 which must be multiplied by 3 lib. 8 shill. the price of the crowne in money of Gold, and it will come to lib. 2454. 12. money of Gold, which di∣vided by 67. 10, to see what the crownes of Mark are worth, and they will make crow. 723. 14. 3. of Mark, and so much shall Ge∣noa have credit in Placentia for the said lib. 3248. 15 of current mo∣ney, as the Example shall more evidently demonstrate. 〈 math 〉〈 math 〉

If in Genoa you would reduce any summe of current mony, in∣to * 1.6 Livers of money of Gold by a short rule, because that the crow. of Gold in current money is 90 shil, and in money of Gold 68 s. you must take of the current money twice ⅔ placing them, the one under the other, and out of one of the said ⅓ take ⅓, and of that which commeth of the said 〈◊〉〈◊〉 you must take 〈◊〉〈◊〉, and adding these 4 parcels together, will come mony of Gold, as will appeare by this Example. 〈 math 〉〈 math 〉

For proofe of the said account, if by the same method you * 1.7 would reduce Livers of Money of Gold into Livers of current Mo∣ney, you must adde to the said Livers of Money of Gold the ^•, and of that which will come thereof, take 〈◊〉〈◊〉, adding the said two par∣cels together, and they will make Livers of current Money: Ex∣ample. 〈 math 〉〈 math 〉

And thus much shall serve for the Exchange of Genoa with Pla∣centia; wherein I have thought fit thus farre to enlarge my selfe, by reason of the great Exchanges continually practised betweene the said two places.

Notes

• * 1.1

  Exchang•…•… of Genoa with Palermo.
• * 1.2

  1. Example.
• * 1.3

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

  Proofe.
• * 1.5

  Third Exam∣ple.
• * 1.6

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

  Proofe.