institutions may be most properly defrayed will divide this third part of the present chapter into three different articles.

Article 1: Of the Public Works and Institutions for facilitating the Commerce of the Society And, first, of those which are necessary for facilitating Commerce in general.

That the erection and maintenance of the public works which facilitate the commerce of any country, such as good roads, bridges, navigable canals, harbours, etc., must require very different degrees of expense in the different periods of society is evident without any proof. The expense of making and maintaining the public roads of any country must evidently increase with the annual produce of the land and labour of that country, or with the quantity and weight of the goods which it becomes