This is the first of three volumes which will contain all of John Locke's writings which relate to An Essay concerning Human Understanding. This volume contains an accurate version of the two earliest known drafts of the Essay. Virtually all of Locke's changes are recorded in footnotes. Volume I was largely completed by Peter Nidditch before his death in 1983. His pioneering editorial techniques won him acclaim for his edition of An Essay concerning Human Understanding in this series in 1975.