When Adam Smith, at the age of forty, resigned his professorship in Glasgow and devoted himself, after three years of travel, to the composition of his Wealth of Nations, he set himself to elaborate the sociological portion of his course on Moral Philosophy. Indeed, at the conclusion of his Moral Sentiments, written during the tenure of his professorship, he had promised “ another discourse ” on the “ general principles of law and government,” including a historical treatment and an account of “ police, revenue and arms.” To be sure, when the work appeared, it was not, in essentials, a continuation of the researches of Montesquieu, and had no authentic connection with Smith’s earlier treatise on morals, Instead, the bulk of it was a strict, and as we should say, a scientific (not a philosophical), inquiry into the origin and conditions of opulence in human communities. Nevertheless, it expounds and is even dominated by a certain social philosophy which is not too convincing when nakedly put. Smith's abiding fame, accordingly, rests more upon the strict scientific analysis of his book than upon its implicit philosophy. Still, the philosophy was there. It had, and it still has, influence. A short discussion of it, therefore, is likely to have something more than historical interest.