or Orders, are wrought partly by the Rule of Three Direct, and partly by the same Rule backward; and the better to distinguish those that are made Direct, and those that are made backward, it is requisite, that the course and manner of Exchanging from one place to another be precisely known and learned, and how that place to which the Commission is sent and given, draw or remit either by a certain or uncertain rate, and such Commissions ought to be made by the Rule of Three backward, taking one of the prices, which are found, for Divisor, and the other two, which are the order'd prices, take for the sum to divide by; and it is to be noted, that the first price, which is taken for Divisor, be of the same place as the last: and to know wherein what is meant by this word
certain and incertain, I shall now declare it.
A
Certain Exchange is no other, than to give a settled price, which varieth not in Exchanging, and hath no change or alteration, as it is seen in Lions, or in Placentia, which gives always
Crowns 100, or Crown 1, to have in Naples Ducats 130 more or less, and this 100 Crowns, or 1 Crown is never found to alter, and therefore term'd by Exchangers to be the
certain price.
Incertain Exchanges is a price that is observed unconstant, and which admits of variation, which shall be when the place which exchangeth, giveth a number of Crowns, Ducats, or Sols, or of any other money which cometh not to the just sum of 100, or else exceedeth the same, and therefore the same not being firm and stable, are named incertain Exchanges, as subject to alteration, sometimes more or sometimes less, which is rightly and well to be considered and understood in
Orders and Commissions of Exchanges given.
When the place then wherein the Commission is to be effected, giveth to the places whereto it ought to remit, and draw, to both of them the Incertain, the account must be made by the Rule of Three Forward or Direct, taking for first and second number the prices that have been orde∣red, and for the last number of the said Rule take one of the prices that are found in such a manner, that the first Exchange of the said Rule be of the same place as the latter. Likewise, when the said place where the Commission is essected, giveth to the places that it ought to remit, and to draw to both of them the certain, the account thereof is made by the said
Rule of …Three forward; as by Example;
Order and Commission is given for a
Merchant to his friend at Lions, to remit to
Naples at Ducaes 126½, and to prevail for
Rome at 85 Crowns, or at another price differing therefrom, provided that it may be done without loss, it is found to remit to
Naples at 125⅓ Ducats, I would now know at how much might the same be drawn for Rome, to the end that this
Commission be fully and justly effected.
It is here first to be considered, that Lions giveth the price certain to the said two places of Naples and Rome, and therefore by that account it must be made by the
Rule of Three for∣ward, saying, If Ducats 126½ give
Crowns 85, the inordered price, how many will Ducas
125⅓ give, the price found for Naples, and it will come to
Crowns 84. 4. 4, and at that price you must draw for
Rome.
By this Commission then it is to be understood, that those of Naples will have Ducats 126½ in
Remittance, in that place, and be Debitors in Rome Crowns 85; who finding to remit at Da∣cats 125⅓, it giveth loss, receiving less than that which is inordered; and making the ac∣count in this abovesaid manner, it is found, that the Draught ought to be made at Crowns 84. 4. 4. which is to profit, becoming this way a less Debitor than that which was inordered, which c•…•…th to recompence the loss which is made in the Remittance; as for Example shall appear;
〈 math 〉〈 math 〉