 Meinong’s first book On Philosophical Science and its Propaedeutics (1885) plays a pivotal role for the understanding of Meinong’s research as well as his teaching activities. Originally, this book was written with the intention to criticize instructions issued by the Ministry of Culture and Instruction to cut down the hours of high school teaching in Philosophical Propaedeutics [philosophisch-propädeutischer Unterricht], i.e., psychology, logic and philosophy. But the book can also be read as a programmatic essay on Meinong’s own views on philosophy and psychology. He makes it clear that philosophy can be done in a scientific rather than in a speculative manner, and he considers psychology as a fundamental subdiscipline of philosophy. Teaching psychology and philosophy cannot consist in the attempt to present finished results or accepted theories; it has to be done by performing experiments and engaging in discussion, respectively. Uncertainty in the domain of knowledge is not to be considered as an obstacle, but rather as a didactically fertile challenge and an opportunity for making progress. Because of this practically-oriented view of philosophy and science, Meinong proposed the establishment of both a Psychological Laboratory and a Philosophical Seminar as university institutions in Graz. As an academic philosopher he made it his duty to find extra time to discuss philosophical matters with his students, friends, and colleagues.