Editorial: A Message to Readers of Historia Mathematica 

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



Isoperimetric Problems in the Variational Calculus of 

      Euler and Lagrange 

      Craig G. Fraser ........................................................ 4



On the History of the Strong Law of Large Numbers and 

      Boole's Inequality 

      E. Seneta ............................................................. 24



Zur Geschichte des Halbgruppenbegriffs 

      Karl H. Hofmann ....................................................... 40



Newton's Principia and Inverse-Square Orbits: The Flaw Reexamined      

      Robert Weinstock ...................................................... 60



NOTE      



W. H. Young at Aberystwyth 

      M. R. Chowdhury ....................................................... 71



SOURCES      



A Note on The Educational Times and {\em Mathematical Questions}      

      I. Grattan-Guinness ................................................... 76



ESSAY REVIEW      



The History of Modern Mathematics, edited by David E. Rowe 

      and John McCleary 

      (John Ewing) .......................................................... 93



IN MEMORIAM      



Evangelos S. Stamatis (1989--1990) 

      Jean P. Christianidis and Nikos Kastanis .............................. 99



Hans Freudenthal (1905--1990) 

      Henk J. M. Bos ....................................................... 106



      ABSTRACTS............................................................. 109                              

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