Petzholdt lavishes labor and space on antiquarian catalogues. He cites them in closely printed pages in double columns at the end of every major subject division and obviously intends the reader to regard them as subject bibliographies. Some antiquarian catalogues are very valuable and others are worthless for this purpose. We have no adequate appraisal of them except these lists by Petzholdt and for this reason he deserves high praise. In fields where no good bibliography is available we are glad to use these catalogues, even though the books have been dispersed. When institutions have purchased the collections _en bloc_, the catalogues have a special importance because the books can still be found with little difficulty. Kuczynski and Knaake are such well-known guides to the poorly-recorded books of the Reformation that they are ordinarily cited simply by the authors' names.[157] The sale catalogues of the libraries of K. W. L. Heyse, K. H. G. Meusebach, and Viktor Manheimer are indispensable aids in the almost uncharted sea of German seventeenth-century literature.[158] Bibliographers and bibliophiles use antiquarian and sale catalogues in tracing the history of particular copies of famous rarities.[159] A student of the Dance of Death consults the Susan Minns catalogue,[160] and Mario Praz compiled a bibliography of emblem books almost exclusively from antiquarian catalogues and catalogues of private libraries.[161] Indispensable, then, as these catalogues often are, the compiler of a list should be alert to reject those of little value. Petzholdt should not have devoted seven pages (pp. 691-696) to antiquarian catalogues of classical Latin and Greek authors. Excellent bibliographies were available and a highly selective list of catalogues would have been sufficient. He could surely have omitted a catalogue (p. 696) of twenty pages issued by E. Weingart in 1864 that contains chiefly ordinary German books. The choice of catalogues for permanent record in a bibliography of bibliographies calls for the judgment and experience that Petzholdt had and did not use.