The reformers of the Encyclopaedia group were not alone in disseminating the idea of Progress. Another group of thinkers, who widely differed in their principles, though some of them had contributed articles to the Encyclopaedia, [Footnote: Quesnay and Turgot, who, though not professedly a Physiocrat, held the same views as the sect.] also did much to make it a power. The rise of the special study of Economics was one of the most significant facts in the general trend of thought towards the analysis of civilisation. Economical students found that in seeking to discover a true theory of the production, distribution, and employment of wealth, they could not avoid the consideration of the constitution and purpose of society. The problems of production and distribution could not be divorced from political theory: production raises the question of the functions of government and the limits of its intervention in trade and industry; distribution involve questions of property, justice, and equality. The employment of riches leads into the domain of morals. The French Economists or "Physiocrats," as they were afterwards called, who formed a definite school before 1760--Quesnay the master, Mirabeau, Mercier de la Riviere, and the rest--envisaged their special subject from a wide philosophical point of view; their general economic theory was equivalent to a theory of human society. They laid down the doctrine of a Natural Order in political communities, and from it they deduced their economic teaching. They assumed, like the Encyclopaedists, that the end of society is the attainment of terrestrial happiness by its members, and that this is the sole purpose of government. The object of a treatise by Mercier de la Riviere [Footnote: L'ordre naturel et essentiel des societes politiqes, 1767.] (a convenient exposition of the views of the sect) is, in his own words, to discover the natural order for the government of men living in organised communities, which will assure to them temporal felicity: an order in which everything is well, necessarily well, and in which the interests of all are so perfectly and intimately consolidated that all are happy, from the ruler to the least of his subjects.