Mark Johnston

Barry Stroud’s The Quest for Reality is a fine book that requires and repays several re-readings. Among the book’s many virtues is its appropriate skepticism towards the metaphysical ambition to treat some basic physical science as a fundamental ontology, an exhaustive account of what there is and how it hangs together. When Galileo concluded that mathematics was the key to the labyrinth of nature, he was prepared to treat all qualitative aspects of reality as sensational effects produced in us by a world that was essentially quantitative in character. This subjectivization of quality, its “introjection” into the mind, was perhaps initially driven by a reluctance to examine the abstractive preconditions of developing and deploying a quantitative vocabulary. Certain topics, among them sensed qualities, had to be set aside because they were not amenable to treatment in such terms. As Stroud emphasizes, to simply go on to suppose that such sensed qualities are not to be found in the world because they are not amenable to such treatment is unmotivated metaphysics, not a simple deliverance of any physical science.