Besides his more famous works of philosophy - Discourse on Method, Meditations on First Philosophy, and Principles of Philosophy - Descartes devoted a great deal of time and thought to the study of physiology and anatomy. An account of his activities in 1629 reports that he visited butcher shops on an almost daily basis to study specific animal organs, and he practiced dissection and even vivisection to explore the workings of major organ systems. In the 1630s, he assisted in the dissection of human cadavers - all to satisfy his intense curiosity about how bodies, animal and human, work. The fruits of this research can be found in his Treatise of Man, a work that he decided not to publish for fear of suffering the same fate as Galileo. Consequently, this fascinating treatise did not appear until twelve years after his death. Among its many intriguing features are his detailed descriptions of the nervous system and its interactions with the muscles to create movement in response to stimulus. Though we now know that many of these details are wrong, Descartes' understanding that much of the body functions as a machine was a stroke of genius. He is the first to describe the reflex arc, anticipating Pavlov and the behaviorists by almost 300 years. The idea of the body as a kind of animal machine that functions according to physical laws was an immense advance over the previous scholastic notions based on Aristotle, which merely begged the question of how the various organs of the body work by stating that it is in their nature to perform their specific functions. This is a landmark work that students of history, medicine, biology, and the history of science will find richly rewarding.
Author
René Descartes, also known as Renatus Cartesius (Latinized form), was a highly influential French philosopher, mathematician, scientist, and writer. He has been dubbed the "Father of Modern Philosophy," and much of subsequent Western philosophy is a response to his writings, which continue to be studied closely. His influence in mathematics is also apparent, the Cartesian coordinate system that is used in plane geometry and algebra being named for him, and he was one of the key figures in the Scientific Revolution. Descartes frequently sets his views apart from those of his predecessors. In the opening section of the Passions of the Soul, a treatise on the Early Modern version of what are now commonly called emotions, he goes so far as to assert that he will write on his topic "as if no one had written on these matters before". Many elements of his philosophy have precedents in late Aristotelianism, the revived Stoicism of the 16th century, or in earlier philosophers like St. Augustine. In his natural philosophy, he differs from the Schools on two major points: First, he rejects the analysis of corporeal substance into matter and form; second, he rejects any appeal to ends—divine or natural—in explaining natural phenomena. In his theology, he insists on the absolute freedom of God’s act of creation. Descartes was a major figure in 17th century continental rationalism, later advocated by Baruch Spinoza and Gottfried Leibniz, and opposed by the empiricist school of thought consisting of Hobbes, Locke, Berkeley, and Hume. Leibniz, Spinoza and Descartes were all versed in mathematics as well as philosophy, and Descartes and Leibniz contributed greatly to science as well. As the inventor of the Cartesian coordinate system, Descartes founded analytic geometry, the bridge between algebra and geometry, crucial to the invention of calculus and analysis. Descartes' reflections on mind and mechanism began the strain of Western thought that much later, impelled by the invention of the electronic computer and by the possibility of machine intelligence, blossomed into the Turing test and related thought. His most famous statement is: Cogito ergo sum (French: Je pense, donc je suis; English: I think, therefore I am), found in §7 of part I of Principles of Philosophy (Latin) and in part IV of Discourse on the Method (French).
