First published in St. Petersburg in 1759, F.U.T. Aepinus's Tenuimen theoriae electricilatis el magnetismi was one of the outstanding achievements of eighteenth-century physics. Its rigorous mathematical investigation of electricity and magnetism was an important and innovative departure from the primarily qualitative and nonmathematical treatments that preceded it. P. J. Connor's translation of the original Latin edition is the first to appear in any western European language, and the introductory monograph and notes by R. W. Home provide a far more definitive account of Aepinus's life...