PREFACE 
Lastly and in a very special sense are the joint authors 
under deep obligation to Mr. John R. Ellingston and Miss 
Rose A. Palmer, of the Editorial Staff, for their cordial 
and unwearying cooperation, without which this book 
could not have been completed. 
C. W. BisHop. 
Freer Gallery of Art, Smithsonian Institution, 
Washington, November 1, 1929. 
[iii] 
