WILLIAM BÜCHER was proud of his collection of Aldines. It was almost complete up to 1529, the year in which Andreas Torresanus, Aldus's father-in- law and the second operator of the press, died. Only two incunables were missing: the Greek Horae and the Reuchlin. The latter was so rare that Bücher didn't know the location of a single copy. It was not listed in the catalogues of the British Museum, the Bibliothèque Nationale, or the John Rylands Library, nor in Proctor's Index, and no copy was recorded in either the American or Italian census of incunabula. A footnote in Renouard's bibliography of Aldines indicated that there might be a copy in Munich.
The Morgan Library had four copies of the Horae, which Bücher thought rather unfair, since he had not been able to acquire even one. Hence, he decided to steal one of the