13. Russell, Bertrand: Lowell Lectures, 1914; Cf. Lect. VIII, pp. 219,
sec. 2, 222, sec. 2; Title, "Scientific Method in Philosophy," Open Court
Publishing Company, Chicago, London.
14. James, William, "Principles . . . .," I, 270; Algebra-analogy; see also
"Fringe," p. 258.