This section devoted to bibliographies of individual authors exhibits some faults typical of Petzholdt's plan. A subdivision (pp. 156-166) without any heading begins the section and is terminated by three asterisks in the middle of the page. Although it is set off typographically, the lack of a heading makes it difficult to perceive that we have in it a list of the very important biobibliographical dictionaries of religious orders and learned academies. There is no indication of this category in the table of contents and the names of the religious orders and the academies do not appear in the index. I do not see how one can readily find a biobibliographical dictionary of the Dominicans or the Jesuits in this arrangement. Not all of us can bring to mind immediately the names Quétif and De Backer that are needed to find the references. In his list of individual bibliographies Petzholdt goes so far as to include books (not bibliographies, be it noticed) dealing with such artists as Jost Ammann, Rembrandt, and Velasquez. He could have found another place for books about famous publishers named Aldus and should probably have made a special place for dictionaries of homonyms.[152] He follows this section of individual bibliographies with a list of books containing portraits ("Ikonographische Literatur," pp. 273-279). Its pertinence to a bibliography of bibliographies seems debatable to me. Petzholdt's execution of his plan leaves something to be desired. He provides the obviously necessary table of contents, but fails to include in it many subdivisions that he expresses by means of headings or typographical devices or only implies by the arrangement of titles. Experience teaches a reader that Petzholdt begins a section with general works, often a modern annual bibliography, proceeds through a chronological list, and concludes with specialized antiquarian catalogues. This is an altogether logical order. Subdivisions of a large category follow the general section. After the general bibliography of medicine, for example, Petzholdt continues with bibliographies of pathology and therapeutics (pp. 597-600). This arrangement makes necessary a full record of the subdivisions in an index, but Petzholdt's index is only an author index. There are occasional failures to include authors' names in the index. We must judge these flaws kindly, for all men are fallible, and bibliographers are no exception to the rule.