Book we should hardly hare detected in it any incompleteness". Locke's design, however, as he explains it himself, was " to inquire into the original, certainty, and extent of human knowledge, together with the grounds and degrees of belief, opinion, and assent" (Book L ch. i. section 2); and these are, almost in so many words, the headings of chapters of the Fourth Book. The Essay is more than empirical psychology; it is a theory of knowledge; and the whole would be incomplete without the

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... ssions in Bk. IV. as to the " extent" and " reality " of our knowledge, " universal" and " trifling " proposition, our knowledge of existence, and the spheres of probability, reason, and faith, to which the theory of the origin of our ideas in Bk. IL is in fact only preliminary. r , a -, Adam Smith.