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Updated: May 26, 2025
The four books of the Principia Philosophiae, published in 1644 and dedicated to Elizabeth, Countess Palatine, give a systematic presentation of the new philosophy. The Discourse on Method appeared, 1644, in a Latin translation, the Meditations and the Principles in French, in 1647. The Treatise on the Passions was published in 1650; the Letters, 1657-67, in French, 1668, in Latin.
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