8.
[107] _Conf._, vii.

18, 19.
[108] Musset-Pathay (ii.

72) quotes the passage from Lord Chesterfield's Letters, where the writer suggests Madame Dupin as a proper person with whom his son might in a regular and business-like manner open the elevating game of gallant intrigue.
[109] M.Dupin deserves honourable mention as having helped the editors of the Encyclopaedia by procuring information for them as to salt-works (D'Alembert's _Discours Preliminaire_).

His son M.Dupin de Francueil, it may be worth noting, is a link in the genealogical chain between two famous personages.

In 1777, the year before Rousseau's death, he married (in the chapel of the French embassy in London) Aurora de Saxe, a natural daughter of the marshal, himself the natural son of August the Strong, King of Poland.