Abstract

Ernst Mach, philosopher, physicist, historian, and physiological-psychologist, presented a bio-psychological model of nature. Although within the community of philosophers Mach has been primarily seen as a physicist who took interest in philosophical questions about the foundations of physics, this thesis places Mach with the context of nineteenth-century evolutionary theory and psychology and sees his views on physics as being largely derivative of his bio-psychology. ;For Mach, nature was a unified whole under the inner direction of evolutionary processes. Evolution produced humans, and humans, still under naturalistic influences, have produced science. Science, then, is deeply part of the natural world, both in its origination and its current practice. Mach can thus be seen as a deep evolutionary naturalist. ;This evolutionary perspective is integrated with psychology. Mach's research in psychology led him to see perception as fundamentally the comparison of contrasts. In fact, evolution, perception, and cognition all followed this model. Furthermore, since science is based upon the act of making measurements, and since measurement is at root the comparison of something to a given standard, all measurement inherently involves psychological comparison. Our knowledge of the world, then, cannot escape the psychological boundaries which constitute it. ;After tracing out Mach's views in bio-psychology, Mach's applications of this to physics are examined. In particular, his famous critique of Newtonian space and time which inspired Einstein can now be seen as partly arising out of the tradition of bio-psychology, and thus a path can be traced from the nineteenth century life sciences to the revolution in twentieth century physics