The only real break in the conformity of Schopenhauer's circumstances to his future career came in 1805, when he was placed in a merchant's office at Hamburg, whither his father had migrated in disgust at the annexation of his native Danzig, then under a republican constitution of its own, by Prussia in 1793. Soon afterwards his father died; but out of loyalty he tried for some time longer to reconcile himself to commercial life. Finding this at length impossible, he gained permission from his mother, in 1807, to leave the office for the gymnasium. At this time he seems to have begun his classical studies, his education having hitherto been exclusively modern. They were carried on first at Gotha and then at Weimar. In 1809 he entered the university of Goettingen as a student of medicine. This, however, was with a view only to scientific studies, not to practice; and he transferred himself to the philosophical faculty in 1810. Generally he was little regardful of academical authority. His father's deliberately adopted plan of letting him mix early with the world had given him a certain independence of judgment. At Goettingen, however, he received an important influence from his teacher, G. E. Schulze (known by the revived scepticism of his _AEnesidemus_), who advised him to study Plato and Kant before Aristotle and Spinoza. From 1811 to 1813 he was at Berlin, where he heard Fichte, but was not impressed. In 1813 the degree of Doctor of Philosophy was conferred on him at Jena for the dissertation _On the Fourfold Root of the Principle of Sufficient Reason_ (_Ueber die vierfache Wurzel des Satzes vom zureichenden Grunde_, 2nd ed., 1847). This was the first result of his Kantian studies. In the same year he began to be acquainted with Goethe at Weimar, where his mother and sister had gone to reside in 1806. A consequence of this acquaintance was that he took up and further developed Goethe's theory of colours. His dissertation _Ueber das Sehen und die Farben_ was published in 1816. A second edition did not appear till 1854; but in the meantime he had published a restatement of his doctrine in Latin, entitled _Theoria Colorum Physiologica_ (1830). This, however, was an outlying part of his work. He had already been seized by the impulse to set forth the system of philosophy that took shape in him, as he says, by some formative process of which he could give no conscious account. His great work, _Die Welt als Wille und Vorstellung_, was ready for publication before the end of 1818, and was published with the date 1819. Thus he is one of the most precocious philosophers on record. For in that single volume, written before he was thirty, the outlines of his whole system are fixed. There is some development later, and there are endless new applications and essays towards confirmation from all sources. His mind never rested, and his literary power gained by exercise. Still, it has been said with truth, that there never was a