Lecture III
[^2]: René Descartes: Lat., Renatus Cartenius, Le Haye (Tourraine) 1598–1650 Stockholm. Mathematician, physicist, philosopher. Educated by the Jesuits in La Fleche, he first became a soldier and was part of some campaigns but turned away from outer life to enter into the loneliness of a striver for knowledge, living first in Paris and then for a long time in Holland. He died in Stockholm, having been called there by Queen Christine. For him, doubt of tradition, but also of all sense perception, was the starting point of his philosophy and he found in self-consciousness the security of all being (“ Cogito ergo Sum”). He developed the method of analytical geometry and gave an explanation of the rainbow. Main works: Essays, 1637, in it “ Discours de la Methode and Dioptiric,” “ Meditationes de Prima Philosophia,” 1641; “ Passions de L'Ame,” 1650. See Riddles of Philosophy.