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Editor's Preface principal work. But in addition to the sketches which somehow and at some time found their way into the works themselves and which Schopenhauer for the most part struck out with his pencil, the manuscripts contain much that was left unprinted during his lifetime and has remained so even till now and which is yet well worth publishing. These unpub- lished passages furnish not merely significant suggestions for the inter- pretation of the world view that was developing and in the course of time was assuming an ever more imposing and pregnant form through proofs, elucidations and extensive investigations. They have a value of their own as evidence of the same strict love of truth to which the finished works owe their existence. Regardless of every false appear- ance and of every deep-rooted tradition, they describe the world and life as they are in reality. The manuscripts which were made over to Julius Frauenstädt and which, after his death in January 1879, went by will to the Royal Library in Berlin, are today in the Institution of Prussian Cultural Heritage (Stiftung Preussischer Kulturbesitz) in Berlin (-West). There are twenty-nine volumes or bundles, most of them bound in folio and furnished with the name and date of commencement. Here we list them in accordance with the distinguishing marks of the Berlin Library which are still retained, but which unfortunately do not follow a chronological order: I-VI VII VIII IX X XI XII XIII XIV XV XVI XVII Transcripts of lectures at Göttingen and Berlin on natural sciences, philosophy, philology and history, with his own marginalia here and there often marked by the addition of the word "ego". Adversaria, begun in Berlin in March 1828 (fol.). Cogitata, begun in Berlin in February 1830, stopped in 1831, and continued in November 1832 (fol.). Pandecta, begun in Mannheim in September 1832, stopped in November 1832, and continued in November 1833 (fol.). Spicilegia, begun in Frankfurt am Main in April 1837 (fol.). Senilia, begun in Frankfurt am Main in April 1852 (fol.). Foliant, begun in Berlin in January 1821, stopped in 1822, and continued in October 1826 (fol.). Quartant, begun in Dresden in November 1824 (4to). Cholerabuch, begun in Frankfurt am Main on 5 September 1831 (4to). Repertorium, Alphabetical Index to the manuscript books written after 1818. Register, Alphabetical Index to the manuscript books written between 1812 and 1818. Reisebuch, begun in October 1818 (small 8vo). viii-