The earlier writings of Schelling either reproduced the thoughts of the Wissenschaftslehre or developed them in the Fichtean spirit. Among those of the latter class we note: Ideas for a Philosophy of Nature, 1797; On the World-Soul, 1798; System of Transcendental Idealism, 1800. During the second period, in which the influence of Bruno and Spinoza is prominent, he works out his own philosophy of identity; at this time he publishes Bruno, or, Concerning the Natural and Divine Principle of Things, 1802, and Method of Academic Study, 1803. In the third period the philosophy of identity becomes the basis for a still higher system in which the influence of German theosophy (Jacob Boehme) is apparent; with the exception of Philosophy and Religion, 1804, the Treatise on Human Freedom, 1809, and a few others, the works of this period did not appear until after Schelling’s death. His previous philosophy is now called by him “negative philosophy;” the higher or positive philosophy has as its aim the rational construction of the history of the universe, or the history of creation, upon the basis of the religious ideas of peoples; it is a philosophy of mythology and revelation. Translations of some of Schelling’s works are to be found in the Journal of Speculative Philosophy, an American periodical founded by W.T. Harris, which devoted itself to the study of post-Kantian idealism. His Complete Works, edited by his son, appeared in 14 volumes, 1856. There is a revival of interest in his philosophy, and new editions of his books are now being published.