Such, indeed, is the extent of our undertaking, that it was necessary to solicit every information, to consult the living and the dead.  The great qualification of him that attempts a work thus general is diligence of inquiry.  No man has opportunity or ability to acquaint himself with all the subjects of a commercial dictionary, so as to describe from his own knowledge, or assert on his own experience.  He must, therefore, often depend upon the veracity of others, as every man depends in common life, and have no other skill to boast than that of selecting judiciously, and arranging properly.

But to him who considers the extent of our subject, limited only by the bounds of nature and of art, the task of selection and method will appear sufficient to overburden industry and distract attention.  Many branches of commerce are subdivided into smaller and smaller parts, till, at last, they become so minute, as not easily to be noted by observation.  Many interests are so woven among each other, as not to be disentangled without long inquiry; many arts are industriously kept secret, and many practices, necessary to be known, are carried on in parts too remote for intelligence.

But the knowledge of trade is of so much importance to a maritime nation, that no labour can be thought great by which information may be obtained; and, therefore, we hope the reader will not have reason to complain, that, of what he might justly expect to find, any thing is omitted.

To give a detail or analysis of our work is very difficult; a volume intended to contain whatever is requisite to be known by every trader, necessarily becomes so miscellaneous and unconnected, as not to be easily reducible to heads; yet, since we pretend in some measure to treat of traffick as a science, and to make that regular and systematical which has hitherto been, to a great degree, fortuitous and conjectural, and has often succeeded by chance rather than by conduct, it will be proper to show that a distribution of parts has been attempted, which, though rude and inadequate, will, at least, preserve some order, and enable the mind to take a methodical and successive view of this design.

In the dictionary which we here offer to the publick, we propose to exhibit the materials, the places, and the means of traffick.

The materials or subjects of traffick are whatever is bought and sold, and include, therefore, every manufacture of art, and almost every production of nature.

In giving an account of the commodities of nature, whether those which are to be used in their original state, as drugs and spices, or those which become useful when they receive a new form from human art, as flax, cotton, and metals, we shall show the places of their production, the manner in which they grow, the art of cultivating or collecting them, their discriminations and varieties, by which the best sorts are known from the worse, and genuine from fictitious, the arts by which they are counterfeited, the casualties by which they are impaired, and the practices by which the damage is palliated or concealed.  We shall, likewise, show their virtues and uses, and trace them through all the changes which they undergo.