Isle St. Louis produces only pulse and culinary vegetables, which are obtained in abundance by those who possess gardens. The neighbouring isles supply amply, quantities of rice and millet. Hitherto the only importance which we attached to the possession of the Senegal, was in consequence of the trade carried on for slaves, gum, gold, elephants’ teeth, and ostrich feathers. Many years ago we used to derive from it wax and hides; but these articles are no longer comprised in our speculations. We give in exchange, brandy, silks, cottons, iron, and all the articles which have been previously mentioned, as forming the barter at other parts of the coast. When the Negroes first began to trade with Europeans, the article on which they set most value was iron; because it served them to make agricultural and warlike instruments. Hence iron soon became the commodity from which they appreciated all other articles. Thus a certain quantity of merchandize of any other kind was estimated to be worth so many bars of iron, which gave rise to the commercial expression of a bar of merchandize: for example, twenty plants of tobacco were considered as a bar of tobacco; and a gallon was called a bar of brandy; while a bar of any merchandize whatever was considered equal in value to a bar of any other kind. The bar therefore is an ideal sort of money; but it necessarily happened that the abundance or scarcity of merchandize was in proportion to the number of foreign ships which arrived; and hence as their relative value was in continual fluctuation, it was necessary to be more decisive. At present the Whites value a bar of any sort of merchandize at four livres sixteen sous (about 3s. 10d. sterling); thus a slave who is valued at 100 bars, costs 490 livres Tournois. In exchanges of this nature, the White merchant has a great advantage over the Negro: for the bar which he gives at the value abovementioned, seldom costs him more than half that price. The African who suspects this, is very difficult to satisfy, and is petulant and tiresome, on account of his ignorance. Isle St. Louis is the general rendezvous for the trade of the Senegal; and the average number of slaves sent there is about 12 or 1500 per annum; though it is asserted to have formerly amounted to 3000. The price of slaves has varied at different periods, on account of the competition and jealousy of different European traders. The Negroes of the Senegal are preferred to all the Blacks of the African coast, as their race is handsomer than the others. But it has been found that they are more fit for domestic services, and for the arts and trades, than for working in the fields, a labour too severe for their constitution.