 At the first opportunity the English correspondents of Arcueil returned to Paris, among them John Leslie (1814) and Charles Blagden (1814, 1816, 1817) who died of apoplexy (1820) during a visit to Berthollet at Arcueil.Mary Somerville who wrote a popular account of Laplace's "Mécanique Céleste" dined at Arcueil with her scientific "heroes" (1817).Jöns Jacob Berzelius had already been invited by Berthollet to come and study at Arcueil in 1810, but it was not till 1818 that the Swedish government judged it appropriate for him to travel to France.