 The Aristotelian tradition anchors the concept of substance, at least in nature, primarily to instances of species of natural object. The Kantian tradition ties it to those enduring bodies the individuation of which gives sense and structure to our spatio-temporal framework. David Wiggins (1967, 1980, 2001) has made a sustained attempt to prove that these two objectives necessarily go together and to make the Aristotelian notion of substance, even including its bias towards the biological, central to our practice of individuating objects.