But, Condillac devoted his whole life, with the exception of an interval as a court-appointed tutor to the court of Parma, was devoted to speculation.
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He had already published several works when the French court sent him to Parma to educate the orphan duke, then a child of seven years.
Michael Hissmann (1752, Hermannstadt – 1784, Göttingen) was a German philosopher, a radical materialist who translated Condillac and Joseph Priestley into German.
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Under the Reign of Terror, he was arrested and imprisoned for nearly a year, during which he studied Condillac and Locke, and abandoned the natural sciences for philosophy.