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 Harré, 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