With the Index Volume, the _Jewish Publication Society of America_ brings to a close the American edition of the “History of the Jews” by Professor H. Graetz. A glance at the title-page and the table of contents will show, that the celebrated historian cannot be held directly responsible for anything this volume contains. The History proper, as abridged under the direction of the author and translated into English from the eleven volume German edition, is complete in five volumes. In compiling this additional volume, the Publication Committee was prompted by the desire to render the work readily available for pedagogical purposes. To be of value to the general reader as well as to the scholar, a work containing upwards of three thousand pages needs to be equipped with indexes, tables, and helps of various kinds. The importance of indexes can hardly be over-estimated. The English jurist and writer who considered them so essential that he “proposed to bring a Bill into Parliament to deprive an author who publishes a book without an Index of the privilege of copyright” was not too emphatic. In books of facts, such as histories, indexes are indispensable. This has been fully recognized in the Society’s edition of Graetz’s “History of the Jews.” Each of the five volumes, as it appeared, was furnished with an adequate index. Yet there are two reasons justifying and even requiring the compilation of a general index to the whole work. The first is the reader’s convenience. All who use books to any extent know the annoyance of taking volume after volume from the shelf to find the desired information only in the last. In fact, the separate indexes were compiled only because circumstances compelled the publication of the single volumes at rather long intervals. The other consideration is that Professor Graetz is the historiographer _par excellence_ of the Jews. His work, at present the authority upon the subject of Jewish history, bids fair to hold its pre-eminent position for some time, perhaps decades. A comprehensive index to his work is, therefore, at the same time an index to the facts of Jewish history approximately as accepted by contemporary scholars--a sufficient reason for its existence.