In 1899 I was unexpectedly again asked by the Delegates of the Oxford University Press to prepare a New Edition of Berkeley’s Works, with some account of his life, as the edition of 1871 was out of print; a circumstance which I had not expected to occur in my lifetime. It seemed presumptuous to undertake what might have been entrusted to some one probably more in touch with living thought; and in one’s eighty-second year, time and strength are wanting for remote research. But the recollection that I was attracted to philosophy largely by Berkeley, in the morning of life more than sixty years ago, combined with the pleasure derived from association in this way with the great University in which he found an academic home in his old age, moved me in the late evening of life to make the attempt. And now, at the beginning of the twentieth century, I offer these volumes, which still imperfectly realise my ideal of a final Oxford edition of the philosopher who spent his last days in Oxford, and whose mortal remains rest in its Cathedral. Since 1871 materials of biographical and philosophical interest have been discovered, in addition to the invaluable collection of MSS. which Archdeacon Rose then placed at my disposal, and which were included in the supplementary volume of _Life and Letters_. Through the kindness of the late Earl of Egmont I had access, some years ago, to a large number of letters which passed between his ancestor, Sir John (afterwards Lord) Percival, and Berkeley, between 1709 and 1730. I have availed myself freely of this correspondence. Some interesting letters from and concerning Berkeley, addressed to his friend Dr. Samuel Johnson of Stratford in Connecticut, afterwards President of King’s College in New York, appeared in 1874, in Dr. Beardsley’s _Life of Johnson_, illustrating Berkeley’s history from 1729 till his death. For these and for further information I am indebted to Dr. Beardsley. ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ In the present edition of Berkeley’s Works, the Introductions and the annotations have been mostly re-written. A short account of his romantic life is prefixed, intended to trace its progress in the gradual development and application of his initial Principle; and also the external incidents of his life in their continuity, with the help of the new material in the Percival MSS. and the correspondence with Johnson. It forms a key to the whole. This biography is not intended to supersede the _Life and Letters_ of Berkeley that accompanied the 1871 edition, which remains as a magazine of facts for reference.