David Robb

Press a square paperweight into a lump of soft clay. What results is a square impression. Could a circular impression have resulted instead? The answer seems to be No. In this paper, I take this and similar examples as evidence for power essentialism, the thesis that the powers bestowed by a property are essential to it. I spend most of the paper trying to answer a few arguments against the evidential value of such examples: (1) there is the appearance of necessity here, but it is of the wrong sort of necessity, say, mere nomological necessity; (2) one gets the appearance of necessity only if powers (such as rigidity) are held fixed, rendering the examples useless as evidence for power essentialism; (3) the examples are too simple, too crudely mechanistic.

_Philosophy of Mind: Contemporary Readings_ is a comprehensive anthology that draws together leading philosophers writing on the major topics within philosophy of mind. Robb and O'Connor have carefully chosen articles under the following headings: *Substance Dualism and Idealism *Materialism *Mind and Representation *Consciousness Each section is prefaced by an introductory essay by the editors which guides the student gently into the topic in which leading philosophers are included. The book is highly accessible and user-friendly and provides a broad-ranging exploration of the subject. Ideal for any philosophy student, this book will prove essential reading for any philosophy of mind course. The readings are designed to complement John Heil's _Philosophy of Mind: A Contemporary Introduction, Second edition _(Routledge 2003), although the anthology can also be used as a stand-alone volume.