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The question of substance in the philosophy of physics has three branches: logical, physical, and epistemological. The first is a problem in pure philosophy: is the notion of “ substance ” in any sense a “ category,” i.e. forced upon us by the general nature either of facts or of knowledge? The second is a question of the interpretation of mathematical physics: is it (a) necessary, or (b) convenient to interpret our formulae in terms of permanent entities with changing states and relations? The third concerns the relation of perception to the physical world.
page 20 Note 1 The following article is a chapter in a forthcoming work. The Analysis of Matter, to be published shortly by Messrs. Kegan Paul.
page 21 Note 1 Tractatus Logico-Philosophicus (Kegan Paul).
page 21 Note 2 Cf. Analysis of Mind, Chap. X.
page 23 Note 1 See Principia Mathematica, vol. i, Introduction to Second Edition