Sabin promises to give "more than a few" bibliographies relative to France and Germany, but does not make clear how he chooses them. He passes over Johannes Tritheim and Conrad Gesner without mention and seems to know little about other sixteenth- and seventeenth-century bibliographies. His wide acquaintance with Americana leads him to mention Antonio León Pinelo's _Epitome_ of 1620, perhaps the first important bibliography of Americana. On the whole, his choice of eighteenth century bibliographies is judicious. He cites the encyclopedic Georgi and such standard catalogues of rare books as Clement and Freytag, although he does not know the last and largest edition of Johannes Vogt, _Catalogus librorum rariorum_. He makes a good selection of eighteenth-century subject bibliographies, which were for the most part still valuable reference works in the 1870's. History is sufficiently represented by Lenglet du Fresnoy and Meusel's edition of Struve. Cave, Du Pin, and Walch are the right books to recommend to a theologian. As far as he goes, Sabin is generally successful in naming histories, which are virtually bibliographies, of national literatures, but J. A. Fabricius, _Bibliotheca mediae et infimae latinitatis_ and J. C. Wolf, _Bibliotheca hebraea_ are lacking. He mentions only a few regional biobibliographies and seems to have had no plan in selecting them. I have examined only his references to Italian examples of this genre, but these are well-known and easily found. In other fields than history and literature he has usually chosen wisely. He knows Pritzel's botanical bibliography and Van der Linden's medical bibliography. He has a blind eye for bibliographies of the religious orders. As we might expect, De Backer's Jesuit bibliography is present, but it is surprising to see no mention of Wadding's account of the Franciscans, who had a large share in the cultural development of the Spanish colonies in America, or Quétif and Echard's biobibliographical dictionary of the Dominicans. In brief, Sabin's book is probably as good a book as can be written in one hundred and fifty pages. A classified and an alphabetical index of subjects would have vastly increased its usefulness. Had he made them, he would have perceived and filled the gaps.