Abstract
This book is an extended reflection on a basic but far-reaching claim: "There are no 'bare' particulars". Because "individuals are necessarily individuals of a kind," Lowe argues, "realism with regard to particulars or individuals... implies realism with regard to sorts or kinds". A "sortal" concept is "a concept of a distinct sort or kind of individuals". Lowe's purpose in this book is to examine the meaning and implications of sortal concepts, and to challenge relativist conceptions of identity and reductivist strategies in metaphysics.