NO apology seems to be needed for presenting the immortal Third book of Locke's Essay in a separateform. All who know it admit that it may be read with great profit by those who have neither time nor inclination to study the rest of the work in which it forms a kind of episode. While it affords the student an admirable example of all that is most characteristic in Locke's style, method and opinions, it has also a real and substantive value of its own. As Hallam remarks, Among many excellent things in the Essay on Human Understanding, none are more admirable than much of the third book on the nature of words, especially the three chapters on their imperfection and abuse.