Editorial: New Year's Greetings from the ICHM 

      Joseph W. Dauben ....................................................... 1



The Fading Amateur: William Lenhart and 19th-Century American 

      Mathematics 

      Edward R. Hogan ........................................................ 6



E. W. von Tschirnhaus: His Role in Early Calculus and His Work 

      and Impact on Algebra 

      Manfred Kracht and Erwin Kreyszig ..................................... 16



Redfield's Proofs on MacMahon's Conjecture 

      E. Keith Lloyd ........................................................ 36      



SOURCES      



On Correspondence between B. Boncompagni and A. Genocchi 

      Giorgio Israel ........................................................ 48



REVIEWS      



Die Geschichte der Geometrischen Mechanik im 19.~Jahrhundert, 

      by Renatus Ziegler 

      (Jeremy Gray) ......................................................... 76



Cultura, Scienze e Tecniche nella Venezia del Cinquecento. 

      Atti del Convegno Internazionale di Studio: Giovan Battista 

      Benedetti e il suo Tempo, edited by Antonio Manno 

      (Michael Segre) ....................................................... 78



      ABSTRACTS.............................................................. 81                              

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