This volume provides the first complete edition of the third and final surviving draft of John Locke's Essay Concerning Human Understanding, dating from 1685, four years before the publication of the Essay itself (December 1689). There is a General Introduction that gives a detailed account of the content and circumstances of composition of this draft, and a Textual Introduction that provides a full description of the manuscript and its history.

J. R. Milton, Professor of the History of Philosophy, King's College London (retired),G. A. J. Rogers, Emeritus Professor of the History of Philosophy, Keele University

J. R. Milton was educated at St John's College, Cambridge, and at Balliol College, Oxford. He taught at Imperial College of Science, Technology and Medicine, and at King's College London, where he was Professor of the History of Philosophy until his retirement in 2014. He has published widely on the history of philosophy in the early modern period, with particular emphasis on the life and writings of John Locke. He is currently General Editor of the Clarendon Edition of the Works of John Locke.

G. A. J. Rogers is Emeritus Professor of the History of Philosophy at Keele University. He was educated at King Edward VI School, Southampton, and the University of Nottingham, before graduate study at St Catherine's College, Oxford, with Gilbert Ryle, Rom Harr?, and David Pears, and a PhD at Keele University with Antony Flew. He was appointed lecturer at Keele in 1972 and remained there for his whole career except for two research fellowships at the University of California, Los Angeles. He is the co-editor of Drafts for the Essay Concerning Human Understanding, Volume I: Drafts A and B (1990), for the Clarendon Edition of the Works of John Locke. Drafts A and B, for the Clarendon Edition of the Works of John Locke (1990).

General Introduction
Work on the Essay, 1672-1683
Writing the Essay, 1683-1689
Draft C of the Essay
Textual Introduction
The History and Description of the Text
The Transcription of the Manuscript
Draft C of the Essay Concerning Human Understanding
Book I
I. [untitled]
II. No Innate Speculative Principles
III. No Innate Practical Principles
IV. Other Considerations about Innate Principles, both Speculative and Practical
Book II
I. Of the Original of our Ideas
II. Of Simple Ideas
III. Of Ideas of one Sense
IV. Of Simple Ideas by more than one Sense
V. Of Simple Ideas of Reflection
VI. Of Ideas both of Sensation & Reflection
VII. Some Farther Considerations of our Simple Ideas
VIII. Of Perception
IX. Of Retention
X. Of Discerning
XI. Of Comparing
XII. Of Composition
XIII. Of Denomination & Abstraction
XIV. Of Simple & Complex Ideas
XV. Of Simple & Mixed Modes
XVI. Of Space & the Simple Modes of it
XVII. Of Duration and its Simple Modes
XVIII. Duration & Expansion considered together
XIX. Of Number
XX. Of Infinity
XXI. Of Solidity
XXII. Of other Simple Modes
XXIII. Of the Simple Modes of Thinking
XXIV. Of the Modes of Pleasure and Pain
XXV. Of Power
XXVI. Of Complex or Mixed Modes
XXVII. Of the Complex Ideas of Substances
XXVIII. Of Collective Ideas of Substances
XXIX. Of Relation
XXX. Of the Relation of Cause & Effect, & some others
XXXI. Of Other Relations
XXXII. Of Clear & Distinct, Obscure & Confused Ideas
XXXIII. Of Real & Phantastical, Adequate & Inadequate Ideas
Appendices
I. Parallel Passages in Drafts A and B, in Draft C, and in the First Edition of the Essay
II. Passages in Drafts A and B that were re-used in Draft C
III. Passages in the First Edition of the Essay not present in Draft C
IV. Passages in Locke's journal re-used in Book IV of the Essay