Mr. and Mrs. Pennell's authorised Life of James McNeill Whistler appeared in two volumes in October 1908, and has had to be reprinted in that form three times since then. Its sale even in that comparatively expensive form has been an unexpectedly large one, proving without doubt that interest in Whistler's life is alive and growing. During the three years since its first publication much new material has come into the hands of the authors, and a complete revision of the book has therefore become necessary. The present volume is, to all intents and purposes, a new one. Many of the older illustrations in the earlier editions have been superseded by new ones, a number of which are reproduced for the first time. For the new material included in this edition the authors and the publisher are indebted to friends and numerous sympathetic correspondents, and they wish to express their indebtedness especially to Mr. John W. Beatty, Director of the Carnegie Institute in Pittsburgh; Mr. E. D. Brooks; Mr. Clifford Gore Chambers; Mr. E. T. Cook; Mr. Leon Dabo; Mr. Frederick Dielmann; Messrs. Dowdeswell; M. Théodore Duret; Mr. A. J. Eddy; Mrs. Wickham Flower; Right Hon. Jonathan Hogg; Mr. H. S. Hubbell; Mr. Will H. Low; Mr. Burton Mansfield; Judge Parry; Mr. H. Reinhardt; Mr. H. S. Ridings; Mr. Albert Rouiller; Miss Alice Rouiller; Mr. William Scott; M. Ströhlen; Mr. Ross Turner; Mr. C. F. G. Turner; Mr. C. Howard Walker; Mr. J. H. Wrenn.