A Natural History of Cage Birds, by J. G. Keulemans; L'Antotrofa Ossia la Coltivazione De' Fiori, by Antonio Piccioli; Life in the New World, by Charles Sealsfield; Deliciae Florae et Faunae Insubricae, by Giovanni A. Scopoli; Abbildungen zu der Naturgeschichte Brasiliens, by Prince Maxmilian Alexander Philipp von Wied-Neuwied; and Les Roses, by Pierre-Joseph Redouté.

In the present supplement the subject arrangement of the earlier lists has been dropped and no attempt has been made to class the items. Instead two separately numbered alphabetical arrangements have been used, one listing books in parts, the other their associated literature. In our definition of the material suitable for inclusion in the collection we give a very broad meaning to the word "associated," and in this section will be found manuscripts, autograph letters, original drawings, steel plates, diaries, and other kinds of material related in one way or another to the books in the primary list. Instead of the two indexes of the 1957 list, there will now be, in the separate publication of this list, a single general index covering both sections.

As this is, after all, a checklist, a complete bibliographic description of each work is not to be found in it, nor such matters as priority of issue or edition, or state of text. Names of authors and artists are given when ascertained, as are the number and type of illustrations. The condition of the parts, whether in wrappers or boards, is briefly noted. It has not seemed necessary -- in a collection where all of the items are of the utmost rarity, as Dr. Dickson observed -- to keep repeating such phrases as "of the greatest rarity" or "unknown to bibliographers." Some information which is included may seem outside the scope of the normal checklist, but this is the working catalog of the collection.

I cannot recall ever using a bibliography or checklist whose compiler did not point out the possibility of errors occurring in the work, and I will indeed be no exception. To anyone suffering from overconfidence or a lack of modesty, I would heartily recommend the chastening effect of cataloging an assemblage of books in parts.

No compiler works alone, and I would like to thank my colleagues at The New York Public Library who have been sources of aid and information, particularly, Mr. William Hanaway, Rare Book Cataloguer, Mr. Wilson Duprey, Prints Division, and Mr. Lewis M. Stark, Rare Book Division. To Dr Dickson I owe much in many ways, but in this instance I am indebted to her for what little I may know about books in parts. Finally, I would like to add special thanks to Dr. John D. Gordan for his constant support and guidance. The aid is theirs and I am grateful; the errors are my own.