The bibliographical section, "Writers of Bibliographies (Bibliothecarum Scriptores)," in a general subject index entitled _Bibliotheca philosophica_ (1616) by Paulus Bolduanus continues the tradition represented by Gesner and Spach. I have not been able to learn much about the life and works of this obscure Pomeranian minister of the gospel, who apparently lived and died in or near the village of Stolp.[52] He wrote bibliographies of theology, history, and philosophy between 1614 and 1622, publishing in the latter year a supplement to his theological bibliography. Petzholdt rightly commends (pp. 458-459) the _Bibliotheca philosophica_ as superior to Spach's _Nomenclator_ but curiously fails to see that Bolduan's notion of philosophy was in general use in the first half of the seventeenth century. A _bibliotheca philosophica_ of that time would include as a matter of course everything but theology, law, and medicine. Petzholdt praises (pp. 771-772) Bolduan's _Bibliotheca historica_ (1620) as a respectable work that shows bibliographical skill and accuracy. These are kinder words than Petzholdt can ordinarily find for a seventeenth-century bibliography and are a corrective to Burkhard Gotthelf Struve's harsh judgment: "In our day, when other works of this sort are available, we can easily dispense with these efforts."[53] Bolduan's bibliography of bibliographies[54] is both longer and more carefully made than Spach's. He has arranged nearly seventy titles alphabetically according to the first names of the authors. He cites catalogues of university libraries (only the Leyden catalogue of 1595 could have been within Spach's reach and he did not know it), the compilations made for the book trade by Nicolaus Basse, Johannes Clessius, and Henning Grosse, the ubiquitous publisher's lists issued by Goltzius and Oporinus, and bibliographical dictionaries of various subjects and the religious orders. Like Spach, whose list he seems to have taken over completely, he has heard of John Boston's catalogue and, like Spach, is ignorant of the author's first name and is compelled to cite it under "Bostonus." He corrects Spach's misspelling of Muzio Pansa's name. He does not, however, include any classical Greek or Latin bibliographers. We can therefore infer that he did not find Gesner's bibliography of bibliographies, where they were mentioned. He might have omitted them on principle, but he also fails to mention some early sixteenth-century bibliographies known to Gesner which he would surely have included, had he known them. An example of such a bibliography is Jacob Rueff's book on astrology. Bolduan names no title that cannot be called a bibliography in some sense. In both extent and accuracy he surpasses Spach. As comparison with Theodore Besterman, _The Beginnings of Systematic Bibliography_,[55] shows, this competent workman gives a good account of the bibliographies available in 1616.