Before revision: In his final philosophical treatise, The Passions of the Soul (), completed in 1649 and dedicated to Queen Christina of Sweden , René Descartes contributes to a long tradition of philosophical enquiry into the nature of "the passions".
After revision: In his final philosophical treatise, The Passions of the Soul (), completed in 1649 and dedicated to Princess Elisabeth of Bohemia , René Descartes contributes to a long tradition of philosophical inquiry into the nature of "the passions".