be included in the New York showing. The Metropolitan
Museum of Art, New York, and certain private collectors
in America, however, generously agreed to lend additional
works for New York alone. We are especially grateful to
them, and also to those in Great Britain who extended their
loans to allow their pictures to cross the Atlantic.

Chief among those who have helped in the preparation of
the exhibition are Messrs. Knoedler and Company In-
corporated who, under the direction of their Vice-President,
Mr. W. F. Davidson, have not only provided the hospitality
of their galleries in New York but have also given invaluable
assistance in the practical arrangements and have succeeded
in tracing a number of little-known works in American
collections. In the latter connexion we are particularly
grateful to Miss Elizabeth Clare and Miss Jane Sabersky of
their New York office and to Mr. Frank Simpson of their
London office, who has also read the proofs. We also wish to
record our thanks to Mr. Carl P. Barbier for information on
Whistler as a book designer and on the later periods of his
life, with special reference to the artist's relationship with
Mallarmé; to Mr. Douglas Cooper for useful advice; to Miss
Ida Darlington of the Members' Library, County Hall,
London, for historical and topographical information; to the
Frick Art Reference Library, New York, and in particular
to Mrs. Henry W. Howell, Jr., who made helpful suggestions
on the water-colours and pastels; to Mr. Hamish Miles for
fruitful discussion and suggestions; to Mr. Harold J. L. Wright, to whom the Arts Council has been similarly in-
debted on several occasions in the past, for his advice on the
selection of etchings and lithographs; and to all those,
among them the Directors of many public and private
galleries, who have given valuable information.

For assistance in the preparation of the catalogue we are
grateful to all those lenders who have provided details
about their pictures, to Mrs. Grizel Beese, who prepared the
chronology, and Miss Elizabeth Johnston, who was re-
sponsible for the bibliography, and to Mr. John Lewis who
undertook the design and typography of the catalogue. We
are also indebted to the Museum of Modern Art, New York,
for permission to use the colour blocks for Plate II.

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