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*1798 - ''Langue des calculs'' (''שפת החישובים'') (בלתי גמורה)
a comprehensive (1767–1773) in 13 vols., written for the young [[Duke Ferdinand of Parma]], a grandson of [[Louis XV of France|Louis XV]], ''{{lang|fr|, }}'' (1776), and two posthumous works, ''{{lang|fr|}}'' (1781) and the unfinished ''{{lang|fr|}}'' (1798).
In [[Paris]] he came much into contact with the circle of [[Denis Diderot|Diderot]]. A friendship with [[Jean-Jacques Rousseau|Rousseau]], which lasted in some measure to the end, may have been due in the first instance to the fact that Rousseau had been domestic tutor in the family of Condillac's elder brother, Jean Bonnot, known as Monsieur de Mably, at Lyon. Thanks to his natural caution and reserve, Condillac's relations with unorthodox philosophers did not injure his career; and he justified abundantly the choice of the French court in sending him to [[Parma]] to educate the orphan duke, then a child of seven years.
In 1768, on his return from Italy, he was elected to the [[Académie française]]; contrary to the popular idea that he attended only one meeting, he was a frequent attender until two years before his death. He spent his later years in retirement at Flux, a small property which he had purchased near [[Beaugency]], and died there on 3 August 1780.
{{מיון רגיל:קונדיאק, אטיין בונו דה}}
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