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Published online by Cambridge University Press: 03 November 2016
Physical Magnitude is of a variety of “kinds”: not of only one or two kinds, nor, on the other hand, of an infinity—or an unlimited number—of kinds, but of a very considerable (though not perhaps quite definite) number of kinds. A catalogue of these—not set out for just that purpose—is to be found on pp. 3-7 of Kaye and Laby (1st Edn.).
In 1939 the writer delivered a Presidential Address to the Mathematical Association of Victoria, on “The Theoretical Structure of Physics” (see Gazette, July, 1940, p. vi.). This was being written up for publication when the outbreak of war interrupted such work. This present paper, on somewhat different lines, was written recently—at the request of Professor T. H. Laby, F.R.S.—for inclusion in the typed Lecture Notes in Natural Philosophy of the University of Melbourne. Some mathematical points elaborated in the Address are referred to briefly in footnotes.