Riemann's Contribution to Differential Geometry 

      Esther Portnoy ..................................................... 1--18



Investigations of an Early Sumerian Division Problem, c. 2500 B.C. 

      Jensøyrup .......................................................... 19--36



Anna Johnson Pell Wheeler: Her Life and Work 

      Louise S. Grinstein and Paul J. Campbell .......................... 37--53



NOTE      



Minoan and Mycenaean Numerals 

      Dirk J. Struik .................................................... 54--58



SOURCES      



The Manuscripts of Paul Charpit 

      I. Grattan-Guinness and S. Engelsman .............................. 65--75



Unpublished Writings of Giuseppe S. Verzaglia 

      Raffaella Franci and Laura Toti Rigatelli ......................... 76--77



A Manuscript by Teofilo Gallaccini in the Siena Municipal Library 

      Rossella Vagaggini ................................................ 78--80



ESSAY REVIEW      



Geschichte der mechanischen Prinzipien und ihrer wichtigsten 

      Anwendungen, by Istvÿn Szabó 

      (Gunhard \AE. Oravas) ............................................. 81--94



BOOK REVIEWS      



Ideas of Space, by Jeremy Gray 

      (Joan L. Richards) ................................................ 95--97      



Les instruments de la théorie des planètes selon

      Ptolémée: 

      Équatoires et horologerie planétaire du XIII$^e$ au XVI$^e$ 

      siècle, by Emmanuel Poulle 

      (Bernard R. Goldstein) ............................................ 97--99



Two Decades of Mathematics in the Netherlands 1920--1940. A 

      Retrospection on the Occasion of the Bicentennial of the 

      Wiskundig Genootschap, edited by E. M. J. Bertin, H. J. M. 

      Bos, and A. W. Grootendors

      (Dirk J. Struik) ................................................. 99--100



Theon of Smyrna. Mathematics Useful for Understanding Plato, by 

      J. Dupuis, translated by Robert and Deborah Lawlor and edited 

      by Christos Toulis and others 

      (Richard D. McKirahan, Jr.) ..................................... 100--104



R. A. Fisher.  The Life of a Scientist, by Joan Fisher Box 

      (N. T. Gridgeman) ............................................... 104--106



The Library of Isaac Newton, by John Harrison 

      (I. Bernard Cohen) .............................................. 106--109



Die mathematischen Studien von G. W. Leibniz zur Kombinatorik:      

      Studia Leibnitiana Supplementa, Vol. XI, by Eberhard Knobloch



Die mathematischen Studien von G. W. Leibniz zur Kombinatorik:      

      Textband: Studia Leibnitiana Supplementa, Vol. XVI, by 

      Eberhard Knobloch 





Leibniz à Paris (1672--1676), edited by A. Heinekamp and D.

      Metter 

      (J. F. Peters) .................................................. 113--123



      ABSTRACTS........................................................ 124--127                              

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