The Third Volume contains the _Analyst_ and _Siris_, which belong to his later life, _Siris_ being especially characteristic of its serene quiet. In both there is a deepened sense of the mystery of the universe, and in _Siris_ especially a more comprehensive conception of the final problem suggested by human life. But the metaphysics of the one is lost in mathematical controversy; that of the other in medical controversy, and in undigested ancient and mediæval learning. The metaphysical importance of _Siris_ was long unrecognised, although in it Berkeley’s thought culminates, not in a paradox about Matter, but in the conception of God as the concatenating principle of the universe; yet this reached through the conception of Matter as real only in and through living Mind. The Miscellaneous Works, after the two juvenile Latin tracts in mathematics, deal with observations of nature and man gathered in his travels, questions of social economy, and lessons in religious life. Several are posthumous, and were first published in the 1871 edition. Of these, perhaps the most interesting is the _Journal in Italy_. The _Discourse on Passive Obedience_ is the nearest approach to ethical theory which Berkeley has given to us, and as such it might have taken its place in the First Volume; but on the whole it seemed more appropriately placed in the Fourth, where it is easily accessible for those who prefer to read it immediately after the book of _Principles_. I have introduced, in an Appendix to the Third Volume, some matter of philosophical interest for which there was no place in the editorial Prefaces or in the annotations. The historical significance of Samuel Johnson and Jonathan Edwards, as pioneers of American philosophy, and also advocates of the new conception of the material world that is associated with Berkeley, is recognised in Appendix C. Illustrations of the misinterpretation of Berkeley by his early critics are presented in Appendix D. A lately discovered tractate by Berkeley forms Appendix E. In the Fourth Volume, numerous queries contained in the first edition of the _Querist_, and omitted in the later editions, are given in an Appendix, which enables the reader to reconstruct that interesting tract in the form in which it originally appeared. The present edition is thus really a new work, which possesses, I hope, a certain philosophical unity, as well as pervading biographical interest. ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐