An essay concerning human understanding. To which are now first added, I. An analysis of Mr. Locke's doctrine of ideas, on a large sheet. II. A defence of Mr. Locke's opinion concerning personal identity, with an appendix. III. A treatise on the conduct of the understanding. IV. Some thoughts concerning reading and study for a gentleman. V. Elements of natural philosophy. VI. A new method of a common place-book extracted from the author's works