emulated one another for the honor of possessing him, but he has not been willing to leave Leipzig. His first remarkable work was his doctor’s thesis: _De historicæ doctrinæ apud sophistas majores vestigiis_, written in 1838. In 1842, he published his excellent work, which has since become classical: “The Life, Labors and age of Thucydides.”(28) From that time, important works, all bearing the stamp of varied and profound scientific acquirements, and of an erudition remarkable for sagacity and elegance, have followed one another without interruption. In 1843, he treated the question of luxury(29) with a master hand, and laid the foundation of his great work—only the first part of which has thus far appeared—at the same time tracing on a large scale the programme of a course of Political Economy according to the historical method.(30) In 1844, he published his historical study on Socialism and Communism,(31) and in 1845 and 1846, his ideas on the politics and the statistics of systems of agriculture. He is, besides, author of an excellent work on the corn-trade;(32) of a remarkable book on the colonial system;(33) of a sketch on the three forms of the state;(34) of a memoir on the relations between Political Economy and classical antiquity;(35) of a work of the greatest interest, on the history of economic doctrines in England in the sixteenth and seventeenth centuries—a work full of the most curious researches;(36) of a book on the economic principle of forest economy,(37) and lastly, of the great work, the first part of which we have translated, under the title of The Principles of Political Economy, and which is to be completed by the successive publication of three other volumes, on the Political Economy of Agriculture, and the related branches of primitive production, the Political Economy of Industry and Commerce, and one on the Political Economy of the State and the Commune. This work, when completed, will be a real cyclopedia of the science.(38)