Franz Brentano (1838-1917) was a pivotal figure in the development of twentieth century philosophy. His work influenced philosophers as diverse as Edmund Husserl, the founder of phenomenology and the philosopher and logician Gottlob Frege.

Foreword to the Routledge Classics Edition Preface to the English Edition Foreword to the 1911 Edition, Franz Brentano Foreword to the 1874 Edition, Franz Brentano Book One: Psychology as a Science 1. The Concept and Purpose of Psychology 2. Psychological Method with Special Reference to its Experiential Basis 3. Further Investigations Concerning Psychological Method. Induction of the Fundamental Laws of Psychology 4. Further Investigations Concerning Psychological Method. The Inexact Character of its Highest Laws. Deduction and Verification Book Two : Mental Phenomena in General 1. The Distinction between Mental and Physical Phenomena 2. Inner Consciousness 3. Further Consideration Regarding Inner Consciousness 4. On the Unity of Consciousness 5. A Survey of the Principal Attempts to Classify Mental Phenomena 6. Classification of Mental Activities into Presentations, Judgements and Phenomena of Love and Hate 7. Presentation and Judgement: Two Different Fundamental Classes 8. Feeling and Will United into a Single Fundamental Class 8. Comparison of the Three Basic Classes with the Threefold Phenomena of Inner Consciousness. Determination of Their Natural Order. Appendix to The Classification of Mental Phenomena Additional Essays from Brentano's Nachlass Concerning Intuitions, Concepts and Objects of Reason Index