Abstract: In this book, Mackie critically examines various philosophical problems raised in John Locke's An Essay Concerning Human Understanding. Mackie carefully considers Locke's treatment of these problems, but also proposes his own resolution of the related issues in contemporary philosophy. In the course of these discussions, Mackie also proposes his theory of a realism combined with a moderate empiricism. In Ch. 1, Mackie considers the distinction between primary and secondary qualities and argues that they might still have some legitimate application. In Ch. 2, he also defends a version of Locke's representative theory of perception. In Ch. 3, Locke's theory of substance is examined and compared with the theories of more recent philosophers, such as Saul Kripke. In Ch. 4, Mackie defends Locke's theory of abstraction against Berkeley's criticisms and suggests his own revision of the theory considered in relation to the problem of universals. In Chs. 5 and 6, Mackie examines and revises Locke's consideration of identity over time and personal identity. Finally, in Ch. 7, Mackie critically discusses Locke's rejection of innate ideas and considers the possibility of a reconciliation of innate ideas and empiricism.

Keywords: abstraction, An Essay Concerning Human Understanding, empiricism, history of philosophy, innate ideas, Locke, Mackie, perception, personal identity, primary qualities, realism, representationalism, secondary qualities, substance, universals