This paperback edition reproduces the complete text of the Essay as prepared by professor Nidditch for The Clarendon Edition of the Works of John Locke. The Register of Formal Variants and the Glossary are omitted and Professor Nidditch has written a new foreword.

Written in an outstandingly clear and lively style, this 1969 book provokes its readers to rethink issues they may have regarded as long since settled.

The aim of this article is to explore the problem of social ontology. The form that the exploration will take is a development of the argument that I presented in The Construction of Social Realty[2]. I will summarize some of the results of that book and then develop the ideas further.