This edition includes the quintessential works of Descartes, to whom modern learning is indebted for some of the most potent factors in its advancement. These are: in Mathematics, the invention of the Binomial Theorem and the application of Algebra to Geometry in the Analytical Geometry; in Physics, the suggestion of the evolution of the universe through Vortices and the discovery of the laws of the Refraction of Light; in Physiology, the doctrine of the Animal Spirits and the theory of the Mechanism of the soul's operation in the body; in Philosophy, the finding of the ultimate reality in subjective consciousness and the deducting thence of an argument for, if not a proof of, the Existence of God; in Epistemology, the grounding of scientific Law on the existence of a true God; in Ethics, the tracing of evil to the necessary error arising from judgments based on finite and therefore imperfect knowledge. Inluded are The Discourse on Method The Meditations The Principles of Philosophy