Aristotelianism is an important corrective both to the naturalistic reductionism prevalent in philosophy, and to the extravagances of Platonism which are reappearing in places. This collection brings together six papers by leading philosophers working within the Aristotelian tradition, covering a number of topics in contemporary metaphysics. The subjects examined include substance, material constitution, the metaphysics of the mind, the nature of mixture, and the analysis of what it is to be a living thing. Contributors: Jonathan Lowe; Peter Simons; John Haldane; Kit Fine; Joshua Hoffman, Gary Rosenkrantz and Michael Rea.