The father of modern western philosophy, René Descartes formulated the first modern version of mind-body dualism, promoting the development of a new science grounded in observation and experiment. Applying an original system of methodical doubt, he dismissed apparent knowledge derived from the senses and reason, establishing a new epistemic foundation on the basis of intuition, expressed in the dictum: "I think, therefore I am" (Cogito, ergo sum). This comprehensive eBook presents Descartes' collected works, with numerous illustrations, rare texts appearing in digital print for the first time, informative introductions and the usual Delphi bonus material. (Version 1)