In his _Discours de Reception_, pronounced before the French Academy in 1753, he formulated his doctrine of literary style, insisting that it is, before all else, the manifestation of order in the evolution of ideas; ideas alone form the basis and inward substance of style. Rejecting merely abstract conceptions as an explanation of natural phenomena, viewing classifications as no more than a convenience of the human intellect, refusing to regard final causes as a subject of science, he envisaged nature with a tranquil and comprehensive gaze, and with something of a poet's imagination. He perceived that the globe, in its actual condition, is the result of a long series of changes, and thereby he gave an impulse to sound geological study; he expounded the geography of species, and almost divined the theory of their transformation or variability; he recognised in some degree the struggle for existence and the survival of the fittest; he regarded man as a part of nature, but as its noblest part, capable of an intellectual and moral progress which is not the mere result of physical laws. Whatever may have been Buffon's errors as a thinker, he enlarged the bounds of literature by annexing the province of natural history as Montesquieu had annexed that of political science. His vision of the universe was unclouded by passion, and part of its grandeur is derived from this serenity. He studied and speculated with absolute freedom, prepared to advance from his own ideas to others more in accordance with observed phenomena. "He desired to be," writes a critic, "and almost became, a pure intelligence in presence of eternal things." How could he concern himself with the strifes and passions of a day to whom the centuries were moments in the vast process of evolving change? In Andre Chenier he found a disciple who would fain have been the Lucretius of the new system of nature. CHAPTER IV ROUSSEAU--BEAUMARCHAIS--BERNARDIN DE SAINT-PIERRE--ANDRE CHENIER I JEAN-JACQUES ROUSSEAU the man is inseparable from Rousseau the writer; his works proceed directly from his character and his life. Born at Geneva in 1712, he died at Ermenonville in 1778. His childhood was followed by years of vagabondage. From 1732, the date of his third residence with Madame de Warens, until 1741, though his vagabondage did not wholly cease, he was collecting his powers and educating his mind with studies ardently pursued. During nine subsequent years in Paris, in Venice, and elsewhere, he was working his way towards the light; it was the period of his gayer writings, ballet, opera, comedy, and of the articles on music contributed to the _Encyclopedie_: he had not yet begun to preach and prophesy to his age. The great fourth period of his life, from 1749 to 1762, includes all his masterpieces except the _Confessions_. From 1762 until his death, while his temper grew darker and his reason was disturbed, Rousseau was occupied with apologetic and autobiographic writings.