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Published online by Cambridge University Press: 03 November 2016
page note 294 * Mr. Thébault has mentioned (Bulletin de la Société royale des Sciences de Liége, 1944, p. 293) that the theorem given by F. R. J. Hervey (Educational Times, Reprint, 1891, p. 37) had already been obtained by S. Kantor (Bulletin des Sciences mathématiques et astronomiques, 1870, p. 138).