There is also a similar, or perhaps a greater coincidence between many parts of his doctrine and the opinions of Sir James Stewart, as detailed in his 'Inquiry into the Principles of Political Economy.' This congruity of opinion is chiefly apparent in their respective conclusions concerning the effects of competition,--the principles of exchangeable value,--the relation between the interest of money and the profit of stock,--the functions of coin,--the rise and progress of credit,--and the sources and limits of taxation. As this author had published his Inquiry many years before Dr. Smith's work appeared, and had, besides, lived in great intimacy with him, there was some reason to believe, what has been often asserted, that he possessed a just claim to some of the doctrines contained in that work, though Dr. Smith never once mentioned his name in any part of his work. But the present Sir James Stewart, who has recently published a full edition of the writings of his father, relinquishes, on his part, all such pretensions. With the partiality of a friend, in ranking his father with Dr. Smith, he gives it as his opinion, however, that both had, with original powers of equal strength, drawn their knowledge from the same source, the French economists. Dr. Mandeville has also, of late, got the credit of being the author of those Principles of Political Economy, which have interested the world for the last fifty years, and to him alone, it is said, not only the English, but also the French writers, are indebted for their doctrines in that science. In the work of this eccentric writer, there seems, indeed, a similarity of opinion on some of the more obvious sources of wealth, particularly in the division of labour, which Dr. Smith investigates so fully; and in the erroneous doctrine of productive and non-productive labour; and also, perhaps, on some other points: but it would be difficult to show, that he ought, on this account, to be considered the author of all, or even the chief part of what has been written on the subject. On this, as well as on all questions of a similar nature, a great diversity of opinions will subsist. But it may be a matter of curiosity to those who are unacquainted with his work, the Fable of the Bees, not only to trace the connection of that author's sentiments with what is advanced by subsequent writers on this important subject, but also to learn his peculiar notions of morality, that attracted, at one time, so much attention. These last, Dr. Smith says, though described by a lively and humorous, yet coarse and rustic eloquence, which throws an air of truth and probability on them, are, almost in every respect, erroneous. Soon after the publication of the Wealth of Nations, Mr. Smith received the following congratulatory letter from Mr. Hume, six months before his death, dated Edinburgh, 1st April 1776.