This issue is dedicated to Professor Viggo Brun.                  



Viggo Brun: In Memoriam 

      Christoph J. Scriba ................................................. 1--6



LaGrange's Early Contributions to the Theory of First-Order Partial 

      Differential Equations 

      S. B. Engelsman .................................................... 7--23



Algebraische Untersuchungen in Italien, 1850--1863 

      Umberto Bottazzini ................................................ 24--37



The Trigonometric Tables of Al-Kashi in his Zij-I Khani 

      Javad Hamadanizadeh ............................................... 38--45



Helmut Hasse in 1934 

      S. L. Segal ....................................................... 46--56



Female Philomaths 

      Ruth and Peter Wallis ............................................. 57--64



NOTE: The History of the Concept of a Finite-Dimensional Vector Space 

      Jeremy Gray ....................................................... 65--70



SOURCES      



Tardy's Letters and Library in Genoa 

      Umberto Bottazzini ................................................ 84--85      



BOOK REVIEWS      



Paradoksÿ Teorii Mnozhestb I Dialektika, by I. N. Burova 

      (I. Grattan-Guinness) ............................................. 92--93



A History of the Mathematics Departments of the University of 

      Colorado, by Burton W. Jones and Wolfgang Thron 

      (G. Baley Price) .................................................. 93--95



Variationen uber ein Zahlentheoretisches Thema von C. F. Gauss, 

      by H. Pieper 

      (Harold M. Edwards) ............................................... 95--96



The Arithmetic of Al-Uqlidisi, by A. S. Saidan      

      (David Pingree) ................................................... 97--98



The Mathematical Work of Charles Babbage by John Michael Dubbey 

      (Philip C. Enros) ................................................ 98--100



ABSTRACTS ............................................................. 101--107                              

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