From 1902 until his death in 1914, Molk was the leader and editor-in-chief of the publication of a French encyclopedia of pure and applied mathematical sciences based upon Klein's encyclopedia.
It was a translation of the volumes in German and required the collaboration of many mathematicians and theoretical physicists from France, Germany, and several other European countries.
It was intended as an erudite and sometimes controversial re-reading of the German edition, by a group of scholars brought together by Jules Molk, professor of rational mechanics at the University of Nancy.
He was familiar with the scientific literature in Germany having lived in Berlin between 1880 and 1884 and having written a thesis focused on an overview of the German breakthroughs in Mathematics.
The first volumes of this French edition appeared in 1908, with the help of ...
Teubner and Gauthier Villars, and the last in 1916, two years after the death of Jules Molk.
Only half of the volumes released from Teubner in 1908 were published, and that with some difficulty.
Nevertheless, such a Franco-German scientific collaboration was remarkable and totally new.
In 1906 Molk was elected a member of the Academy of Sciences Leopoldina.