David E. Cartwright is a Professor of Philosophy and Religious Studies and the chair of the Department of Philosophy and Religious Studies at the University of Wisconsin, Whitewater. He has numerous publications in nineteenth-century German philosophy and has edited and translated a number of Schopenhauer's books, most recently, with Edward E. Erdmann, The Two Fundamental Problems of Ethics (2010); and he is the author of Schopenhauer: A Biography (2010). Edward E. Erdmann is an emeritus faculty member of the University of Wisconsin, Whitewater with a scholarly background in classical and early modern rhetorical theory. He writes regularly on subjects in agriculture, has edited German translations of textbooks and scientific reports on organic agriculture. Christopher Janaway is Professor of Philosophy at the University of Southampton. He has published widely on nineteenth-century German philosophy, including Self and World in Schopenhauer's Philosophy (1989), The Cambridge Companion to Schopenhauer (1999), Schopenhauer: A Very Short Introduction (2002), and Beyond Selflessness: Reading Nietzsche's Genealogy (2007). He is General Editor of The Cambridge Edition of the Works of Schopenhauer, in which he has translated The Two Fundamental Problems of Ethics and co-translated The World as Will and Representation, Volume 1.

'This new translation of three of Schopenhauer's essays is of a very high quality and is testament to the customary rigor of the Cambridge Translations. Undoubtedly, this new edition will become in time the standard work of reference for English-speaking scholars worldwide.' Philosophischer Literaturanzeiger

• General editor's preface; Editorial notes and references; Introduction; Notes on text and translation; Chronology; Bibliography; Part I. On the Fourfold Root of the Principle of Sufficient Reason: 1. Introduction; 2. Survey of what is most important in previous teachings about the principle of sufficient reason; 3. Inadequacy of previous accounts and sketch of a new one; 4. On the first class of objects for the subject and the form of the principle of sufficient reason governing in it; 5. On the second class of objects for the subject and the form of the principle of sufficient reason governing in it; 6. On the third class of objects for the subject and the form of the principle of sufficient reason governing in it; 7. On the fourth class of objects for the subject and the form of the principle of sufficient reason governing in it; 8. General remarks and results; Variants in different editions; Collation of the two editions; Part II. On Vision and Colours: 9. On vision; 10. On colours; Variants in different editions; Part III. On Will in Nature: 11. Introduction; 12. Physiology and pathology; 13. Comparative anatomy; 14. Plant physiology; 15. Physical astronomy; 16. Linguistics; 17. Animal magnetism and magic; 18. Sinology; Reference to ethics; Conclusion; Variants in different editions; Glossary of names; Index.

David E. Cartwright is a Professor of Philosophy and Religious Studies and the chair of the Department of Philosophy and Religious Studies at the University of Wisconsin, Whitewater. He has numerous publications in nineteenth-century German philosophy and has edited and translated a number of Schopenhauer's books, most recently, with Edward E. Erdmann, The Two Fundamental Problems of Ethics (2010); and he is the author of Schopenhauer: A Biography (2010). Edward E. Erdmann is an emeritus faculty member of the University of Wisconsin, Whitewater with a scholarly background in classical and early modern rhetorical theory. He writes regularly on subjects in agriculture, has edited German translations of textbooks and scientific reports on organic agriculture. Christopher Janaway is Professor of Philosophy at the University of Southampton. He has published widely on nineteenth-century German philosophy, including Self and World in Schopenhauer's Philosophy (1989), The Cambridge Companion to Schopenhauer (1999), Schopenhauer: A Very Short Introduction (2002), and Beyond Selflessness: Reading Nietzsche's Genealogy (2007). He is General Editor of The Cambridge Edition of the Works of Schopenhauer, in which he has translated The Two Fundamental Problems of Ethics and co-translated The World as Will and Representation, Volume 1.

'This new translation of three of Schopenhauer's essays is of a very high quality and is testament to the customary rigor of the Cambridge Translations. Undoubtedly, this new edition will become in time the standard work of reference for English-speaking scholars worldwide.' Philosophischer Literaturanzeiger

• General editor's preface; Editorial notes and references; Introduction; Notes on text and translation; Chronology; Bibliography; Part I. On the Fourfold Root of the Principle of Sufficient Reason: 1. Introduction; 2. Survey of what is most important in previous teachings about the principle of sufficient reason; 3. Inadequacy of previous accounts and sketch of a new one; 4. On the first class of objects for the subject and the form of the principle of sufficient reason governing in it; 5. On the second class of objects for the subject and the form of the principle of sufficient reason governing in it; 6. On the third class of objects for the subject and the form of the principle of sufficient reason governing in it; 7. On the fourth class of objects for the subject and the form of the principle of sufficient reason governing in it; 8. General remarks and results; Variants in different editions; Collation of the two editions; Part II. On Vision and Colours: 9. On vision; 10. On colours; Variants in different editions; Part III. On Will in Nature: 11. Introduction; 12. Physiology and pathology; 13. Comparative anatomy; 14. Plant physiology; 15. Physical astronomy; 16. Linguistics; 17. Animal magnetism and magic; 18. Sinology; Reference to ethics; Conclusion; Variants in different editions; Glossary of names; Index.

David E. Cartwright is a Professor of Philosophy and Religious Studies and the chair of the Department of Philosophy and Religious Studies at the University of Wisconsin, Whitewater. He has numerous publications in nineteenth-century German philosophy and has edited and translated a number of Schopenhauer's books, most recently, with Edward E. Erdmann, The Two Fundamental Problems of Ethics (2010); and he is the author of Schopenhauer: A Biography (2010). Edward E. Erdmann is an emeritus faculty member of the University of Wisconsin, Whitewater with a scholarly background in classical and early modern rhetorical theory. He writes regularly on subjects in agriculture, has edited German translations of textbooks and scientific reports on organic agriculture. Christopher Janaway is Professor of Philosophy at the University of Southampton. He has published widely on nineteenth-century German philosophy, including Self and World in Schopenhauer's Philosophy (1989), The Cambridge Companion to Schopenhauer (1999), Schopenhauer: A Very Short Introduction (2002), and Beyond Selflessness: Reading Nietzsche's Genealogy (2007). He is General Editor of The Cambridge Edition of the Works of Schopenhauer, in which he has translated The Two Fundamental Problems of Ethics and co-translated The World as Will and Representation, Volume 1.

'This new translation of three of Schopenhauer's essays is of a very high quality and is testament to the customary rigor of the Cambridge Translations. Undoubtedly, this new edition will become in time the standard work of reference for English-speaking scholars worldwide.' Philosophischer Literaturanzeiger

• General editor's preface; Editorial notes and references; Introduction; Notes on text and translation; Chronology; Bibliography; Part I. On the Fourfold Root of the Principle of Sufficient Reason: 1. Introduction; 2. Survey of what is most important in previous teachings about the principle of sufficient reason; 3. Inadequacy of previous accounts and sketch of a new one; 4. On the first class of objects for the subject and the form of the principle of sufficient reason governing in it; 5. On the second class of objects for the subject and the form of the principle of sufficient reason governing in it; 6. On the third class of objects for the subject and the form of the principle of sufficient reason governing in it; 7. On the fourth class of objects for the subject and the form of the principle of sufficient reason governing in it; 8. General remarks and results; Variants in different editions; Collation of the two editions; Part II. On Vision and Colours: 9. On vision; 10. On colours; Variants in different editions; Part III. On Will in Nature: 11. Introduction; 12. Physiology and pathology; 13. Comparative anatomy; 14. Plant physiology; 15. Physical astronomy; 16. Linguistics; 17. Animal magnetism and magic; 18. Sinology; Reference to ethics; Conclusion; Variants in different editions; Glossary of names; Index.