The earliest traces of navigation and commerce are necessarily involved in much obscurity, and are, besides, few and faint. It is impossible to assign to them any clear and definite chronology; and they are, with a few exceptions, utterly uncircumstantial. Nevertheless, in a work like this, they ought not to be passed over without some notice; but the notice we shall bestow upon them will not be that either of the chronologist or antiquarian, but of a more popular, appropriate, and useful description. The intercourse of one nation with another first took place in that part of the world to which a knowledge of the original habitation of mankind, and of the advantages for sea and land commerce which that habitation enjoyed, would naturally lead us to assign it.