Isidore Auguste Marie François Xavier Comte, the founder of the Positive philosophy, was born at Montpellier, in France, Jan. 19, 1798. Entering the Ecole Polytechnique at Paris in his seventeenth year, he showed mathematical talent, but was expelled for insubordination. In 1818 he met St. Simon, and for six years he remained under the influence of that philosopher; but in 1824 he broke away and entered on an independent philosophical career. In 1826 he expounded to a distinguished audience his system of Positive philosophy, but during the course had an attack of insanity which lasted for a few months. Between 1830 and 1842 he published his "Cours de Philosophie Positive." From 1835 to 1845 he acted as examiner at the Ecole Polytechnique, but after 1845 he was supported by a "subsidy" from his admirers. Comte married in 1825, but his marriage was not happy, and ended in a separation in 1842. He died on September 5, 1857. His other important works are "The System of Positive Politics" and the "Positivist Catechism." _I.--Positive Classification of the Sciences_ On studying the development of human intelligence, it is found that it passes through three stages: (1) The theological, (2) the metaphysical, (3) the scientific or positive. In the theological stage it seeks to account for the world by supernatural beings. In the metaphysical stage it seeks an explanation in abstract forces. In the scientific, or positive, stage it applies itself to the study of the relation of phenomena to each other. Different sciences have passed through these stages at different rates. Astronomy reached the positive stage first, then terrestrial physics, then chemistry, then physiology, while sociology has not even yet reached it. To put social phenomena upon a positive basis is the main object of this work; its secondary object is to show that all branches of knowledge spring from the same trunk. An integration of the sciences on a positive basis should lead to the discovery of the laws which rule the intellect in the investigation of facts, should regenerate science and reorganise society. At present the theological, the metaphysical, and the positive conflict, and cause intellectual disorder and confusion.