(3) We have just seen the influence which the progress of the physical sciences had upon Say’s conception of political economy; but he was also much influenced by the progress of industry. Between 1776, the date of the appearance of the _Wealth of Nations_, and the year 1803, when Say’s treatise appeared, the Industrial Revolution had taken place. This is a fact of considerable importance for the history of economic ideas. When Say visited England a little before 1789, he found machine production already in full swing there. In France at the same date manufactures were only just beginning. They increased rapidly under the Empire, and the progress after 1815 became enormous. Chaptal in his work _De l’Industrie française_ reckons that in 1819 there were 220 factories in existence, with 922,200 spindles consuming 13 million kilograms of raw cotton. This, however, only represented a fifth of the English production, which twenty years later was quadrupled. Other industries were developing in a similar way. Everybody was convinced that the future must be along those lines—an indefinite future it is true, but it was to be one of wealth, work, and well-being. The rising generation was intoxicated at the prospect. The most eloquent exposition of this debauchery will be found in Saint-Simonism. Say did not escape the infection. While Smith gives agriculture the premier place, Say accords the laurels to manufactures. For many years industrial problems had been predominant in political economy, and the first official course of lectures given by Say himself at the Conservatoire des Arts et Métiers was entitled “A Course of Lectures on Industrial Economy.”