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myself, that what Additions and Improvements it has received from my Labours, would entitle me further to your Favour and Protection. I am,

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PREFACE.

THE many Impreffions this Book has passed through, is a fufficient Evidence of its great Utility; and the Proprietors, in grateful Acknowledgment to the Public for their favourable Reception of it, having thought it ftill capable of further Improvement, have, in this new Edition, fpared no Expence in having the Plan of the Work new modelled, methodized, and improved. And for my own Part, without detracting from the Merit of its late Author, I may venture to say, that The Negociator's Magazine has derived no fmall Advantage from the Additions now made to it. The Subject being handled in a more methodical Manner than before; for as the Book contains an Account of the Exchanges, Coins, Weights and Meafures of the greatest Part of the known World, I have first begun with the Nature of Exchange itself, and with the Laws relative to Bills of Exchange; and to render this Part more useful and complete, have inferted the feveral Cafes concerning Promiffory, &c. Notes, with the Advantage of a running Title throughout the whole. Then I have proceeded to give an Account of the Monies, Weights, and Measures of the different Places, with their Courfes of Exchange. After this follow Examples of computing the different Exchanges of the feveral Countries in Europe, likewife Examples

of the Weft-India Exchange, with most of the

Operations at Length, and feverat concife Ways

of performing them. Then follow in Order Simple

and Compound Arbitrations of Exchanges, in which

I have given fundry Examples wrought at full

Length; and as this is the most difficult Part of

Computation, have enlarged more fully thereon; and

laftly, for the Accommodation of the Tradefman as

well as Merchant, feveral new Tables are added,

which were never before published, with a new and

familiar Method of Notation, whereby the Price

of any Quantity of Goods, &c. may be known in

moft Cafes by Infpection, and in thofe the more

intricate, in a fourth Part of the Time they can

be performed by any other Tables; (having given
Decimals to all the Weights, Meafures, &c. in
Ufe.) To which are annexed Tables for ftandarding
Gold and Silver, with the Affay Table of Sir Ifaac
Newton, which I have recalculated to the 1000th
Part of a Grain. Thus having endeavoured to
give an Account of the Performance, I fubmit
what I have contributed towards rendering it a
more complete Magazine of Mercantile Knowledge
to the Candour of the Public

CONTENTS.

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