That Franklin was not without his influence in eighteenth-century economic thought we may gather from Dugald Stewart's opinion that "the expressions _laissez-faire_ and, _pas trop gouverner_ are indebted chiefly for their extensive circulation to the short and luminous comments of Franklin, which had so extraordinary an influence on public opinion in the old and new world."[i-239] Mr. Carey maintains that Franklin, unlike the physiocrats, inveighed against trade regulations because they led to smuggling rather than because to any important degree they violated the "natural order." The physiocrats are tenuous, amorphous, and ambiguous when they seek to define _L'Ordre naturel_. At times Dupont de Nemours seems to identify it with a primitivistic past.[i-240] Quesnay, on the other hand, says: "Natural right is indeterminate in a state of nature. The right only appears when justice and labour have been established."[i-241] Again, he asserts: "By entering society and making conventions for their mutual advantage men increase the scope of natural right without incurring any restriction of their liberties, for this is just the state of things that enlightened reason would have chosen."[i-242] Natural order is a "providential order": "Its laws are irrevocable, pertaining as they do to the essence of matter and the soul of humanity. They are just the expression of the will of God."[i-243] According to the physiocrats, the laws of the natural order are "unique, eternal, invariable, and universal."[i-244] Now it is true that nowhere did Franklin assert that his advocacy of laissez faire and agrarianism was neatly dependent on these a priori bases. Even though this is true, there are references (quoted above) which seem to suggest that trade restrictions are violations of the very nature of things. It is not wholly fanciful (bearing in mind Franklin's adoration of a Deity who is the creator and sustainer of immutable, universal physical laws which together present the mind with the concept of a vast, wonderfully harmonized physical machine) to conjecture to what extent this matchless physical harmony tended to challenge him with the possibility of discovering a parallel economic machine operating according to immutable laws capable of proof and human adaptability.