  In the three years before his death in 1916, Duhem wrote Le Système du monde, but did not succeed in finishing it. He intended it as a twelve-volume work on the history of cosmological doctrines, ending with Copernicus. He completed nine volumes, the first five being published from 1914 to 1919, and the next four having to wait until the 1950s; a tenth, incomplete volume was also published then. These tomes impart an enormous amount of information about medieval astronomy, astrology, tidal theory, and geostatics, again presenting many sources for the first time in the modern era. They also trace developments in doctrines associated with such concepts as infinity, place, time, void, and the plurality or unity of the world. Duhem intended to write a 300-page summary of his results after he was done with the Le Système du monde; he did not have the time to accomplish what would have surely been an amazing volume. (Duhem [LAS] is an attempt to construct such a single volume from the ten volumes of the Le Système du monde.)