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Published online by Cambridge University Press: 03 November 2016
* Jan. 1908, pp. 207-208 (on p. 207, I. 22, for temporary read temporal; I. 31, after it add, or rather its sign; I, 41, for geometrical read kinematical); July, 1908, p. 307
† So that cardinal numbers would seem to be excluded.
‡ Two things may lead to confusion : Numbers are spoken of on p. 28 as being made continuously variable; and, on p. 64, ω is said to be a power, an ordinal is said to be a cardinal.