These names illustrate the variety of bibliographies known to Gesner and his clear conception of what a bibliography of bibliographies should be. He has admitted only pertinent books and has arranged their titles carefully in alphabetical order according to first names. He has given sources for citations that he has not verified and for books that he knows to be in manuscript or probably lost. He has commented occasionally on the quality of a book or has told how it was arranged. For example, he says that Rueff's astrological bibliography contains pictures of men and instruments and comments in German verse. He does not give the dates and places of publication, but bibliographers have been slow to learn the importance of citing these details. No doubt he expected his readers to consult his biobibliographical dictionary, the _Bibliotheca universalis_ of 1545, for that information. A sixteenth-century scholar, who was accustomed to find books arranged according to format, might have complained that Gesner did not indicate the size of the books. In his procedure he goes beyond St. Jerome, who was content to cite only names. Gesner cites titles. In Pars viii, "De mirabilibus," the last subdivision of Titulus XIII, Gesner gives a hasty account of books about marvels and noteworthy things. Although he cites several lost classical works on the subject and Alessandro Alessandri, _Geniales dies_, which had appeared in print a generation before the _Pandectae_, he makes no great effort to deal bibliographically with the subject. He obviously regards such works as collections of odds and ends and therefore akin to miscellanies. He says, for example, that geographers tell strange tales about the shapes and manners of men and the nature of countries, skies, and seas. He could, he says, have given here references to ancient statues and inscriptions, but has preferred to classify them under history. Poetry and invented tales might also be mentioned and riddles, he thinks, are not to be neglected. The remaining tituli of the first book deal with matters akin to grammar in its usual modern sense but include several specialized bibliographies that we need not examine closely.[41] Gesner's bibliography of bibliographies represents an auspicious beginning of a very difficult variety of bibliography.