books.google.co.nz - This book is a study of John Locke's metaphysics of organisms and persons, with particular emphasis on his theory of identity through time and his conventionalism with respect to kinds and essences. Although these positions seem to be obviously incompatible-his persistence conditions for organisms and...http://books.google.co.nz/books/about/Locke_on_Essence_and_Identity.html?id=GrYnFL0UIPIC&utm_source=gb-gplus-shareLocke on Essence and Identity