The death of Vilhelm Grundtvig (1866-1950) and the destruction of his collectanea during the war make it certain that the bibliography of bibliographies that he and Joris Vorstius planned will never appear. He had called for help in the enterprise in an article[195] published in 1926 and had obtained approval of it at the international meeting of librarians at Madrid in 1935. During the course of his work he succeeded in gaining the assistance of Joris Vorstius, whom we have learned to know as the editor of annual surveys of current bibliographies. He wrote in 1940 in a review of Theodore Besterman, _A World Bibliography of Bibliographies_, that his collectanea were arranged according to countries for submission to various workers who might criticize and supplement them.[196] The loss of this compilation is greatly to be regretted because the experience and good judgment of the two editors make it certain that the book would have been comprehensive, well-planned, and satisfactorily executed. On several occasions Grundtvig stated briefly the task of making a bibliography of bibliographies. His ability to see clearly its difficulties, his wide reading, and his recognition of the many types of bibliographical works that must be considered make these preliminary statements valuable. A long article of 1903 entitled "Gedanken über Bibliographie"[197] was suggested by A. G. S. Josephson's pamphlet, which will be mentioned later. Here Grundtvig points out the varieties of existing bibliographies and their defects and gives examples of unfamiliar or neglected varieties. For example, he comments (pp. 415-417) on the lists of antiquarian catalogues and catalogues of private libraries. Although we now have more information about these catalogues than Grundtvig found in 1903, we still have no critical bibliographies of them. He points out (p. 418) the unsatisfactory quality of bibliographies of ephemeral publications (chapbooks and the like) and surveys the available lists. He has, to be sure, overlooked one of the earliest of such lists--Giovanni Cinelli Calvoli, _Della biblioteca volante_ (Padua, 1677-1716; 2d ed., 1734-1747. ICN [2d ed.])--but it is rare and virtually unknown. He comments incisively on the lists of collective biographies (pp. 420, 441) and suggests the need for a more critical survey of them.[198] Although Grundtvig's article is not easy reading, it is a very stimulating survey of bibliographies. Any writer of a bibliography of bibliographies should read it attentively.