as well as in scholarly references. The other number is a shelfmark (Warn. ..., Seal. ..., Hebr. ...) and in fact only of importance to the staff of the Library, because they indicate the book cases where the MSS are stored. In former days these shelf-marks enjoyed a more general use and that is the reason why Steinschneider, following earlier catalogues, arranged his descriptions according to these numbers; consequently some famous MSS in the collection became known as Warn. 14 or Seal. 3. Because of the very close connection between Steinschneider’s catalogue and our Supplement it was thought best to present the MSS in the same order and under the same refer ences and this arrangement was extended to the third part of this catalogue. It should, however, be noted, that the Or. nos., which always accompany these shelf- marks, are the ones to which reference should be made. To facilitate this, an Index of Press-marks is given at the end of the volume. Confusion might also be caused by the fact that the press-mark Hebr. is not reserved solely for MSS in the Hebrew lan guage but is also used for Armenian, Ethiopic and Syriac MSS. The intervals in the higher Hebr. nos. are therefore due to the fact that the intermediate nos. belong to MSS of no relevance to Hebrew or Hebraic studies. For the MSS in this Catalogue with text in languages other than Hebrew see the General Index under the respective headings. Preliminary work on several fragments was done by Dr. W. Baars, Prof. P. A. H. de Boer and Drs. T. de Bruin, and the author has made use of their findings. P. A. H. de Boer’s “Hebrew Biblical Manuscripts in the Netherlands”, In Memoriam Paul Kahle, ed. M. Black and G. Fohrer (Berlin 1968) was used for the Biblical MSS. Occasional references to MSS in the Bibliotheca Rosenthaliana and the Etz Haim Librairy at Amsterdam can be found in L. Fuks and R. G. Fuks-Mansfeld, Hebrew and Judaic Manuscripts in Amsterdam Public Collections, I: Catalogue of the Manuscripts of the Bibliotheca Rosenthaliana University Library of Amsterdam (Leiden 1973) and II: Catalogue of the Manuscripts of Etz Haim/Livraria Montezinos Sephardic Community of Amsterdam (Leiden 1975). For advice and help on several subjects the author is indebted to Drs. C. Bruehl, Prof. E. Fleischer, Dr. L. Fuks, Drs. H. J. de Jonge and Dr. Y. Ratzabi, whose suggestions, though varying in scope and content, all proved very helpful and occa sionally indispensable. Dr. W. Baars, Prof. T. Jansma and Dr. P. Obbema read the text in its early stages and each exercised, in his own way, a wholesome influence on its final form. Mrs. Margaret Walker translated the Introduction into English and revised and corrected the remainder of the text both in an admirable and accurate way. The author owes much to the Department of Hebrew Language and Literature of the University of Leiden, which gave him the opportunity and the time to undertake and to complete this work. The helpful assistance of various members of the staff of the Library deserves special mention, but explicitly the names of Drs. J. J. Witkam and Miss L. Faasen for their meticulous proof-reading.

Amersfoort-Leiden, June 1976.