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Journal of the History of Philosophy 39.1 (2001) 145-146



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Nicholas Jolley. Locke. His Philosophical Thought. Oxford: Oxford University Press, 1999. Pp. 233. $55.00, cloth; $19.95, paper.

One of the main aims of this lean and clearly set out book is "to argue for the fundamental unity of Locke's thought" in the Essay concerning Human Understanding. Thus while it deals with many of the usual 'central themes' (ideas, knowledge, freedom, personal identity, etc.), this Locke is more ambitious than are other general surveys of the Essay. Another, related aim of the book is to defend Locke against charges of inconsistency. Here, it is successful in many instances. But even as sympathetic a reader as Jolley has to admit several times that there are in Locke's text "elements of inconsistency," positions that are "hard to reconcile" with each other, and "tensions" if not contradictions.

For the most part Jolley's exposition follows the structure of the Essay, beginning with "the origin and nature of ideas," going through the various topics from Book II, then moving to themes in Book III ("Classification and Language") and ending with an account of Book IV ("Knowledge and Faith"). He proceeds by giving brief expositions of Locke's arguments on the issues at hand, sometimes reflecting on alternative readings, and considering objections to, and defences of Locke. There is some discussion of other major seventeenth-century philosophers, and there are—fairly general—references to the corpuscular philosophy and to Aristotelianism. But on the whole, Jolley does not burden his account with much historical context, focusing instead on individual "issues" and arguments concerning Locke's own text.

Yet, sometimes Jolley's discussion of Locke's arguments leaves the reader with statements that require considerable elaboration. For example, in his treatment of Reid's critique of Locke's account of personal identity (according to which Locke's theory is inconsistent with the transitivity of identity), he ends his discussion by simply stating that "it is not obviously foolish to question whether the transitivity relation holds for identity over time" (121). Foolish or not, what is obvious is that more needs to be said to make this suggestion plausible, both in itself and as part of a reading of Locke.

At other times Jolley's expositions are not as clear as they might be and remain unconvincing. Thus, in defending Michael Ayers's much debated view that all Lockean ideas are of the nature of mental images, he concedes that it is difficult to accommodate Locke's ideas of reflection (i.e., ideas of mental operations) to this reading. Yet he defends it, saying that Locke interprets the imagist programme "with some latitude." But if ideas of reflection are excluded, it would seem rather difficult to persist with the claim that Locke "is indeed an imagist." This relates to another issue that is much discussed in Locke scholarship: the notion of what Locke calls "substratum" or "pure substance in general." As Jolley reports, Michael Ayers has argued that 'substratum' does not stand for a bare particular but must be understood in the light of Locke's doctrine of real essence: real essence and substance are not to be equated but they pick out the same thing. Thus, according to Ayers, when Locke draws attention to our ignorance of both substance and real essence, he is not preaching agnosticism at two distinct metaphysical levels. Jolley rejects this reading. But while he points out, rightly in my view, that substratum concerns our thinking about objects, in places he appears to accept that the notion is a metaphysical one, for he holds (against Ayers) [End Page 145] that the distinction between substratum and real essence does concern different metaphysical levels (73). Locke himself is clear enough about the status of the "notion of pure substance in general." When he introduces it (II.xxiii.2), he does so as part of his account of how complex ideas of substances are formed: the notion is part of our ideas of particular kinds of substances. Now this notion cannot be derived...

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