1. Thomas L. Heath, The Thirteen Books of Euclid’s Elements, Dover, New York, 1956, pp. 199–200.
2. Herbert Feigl, ‘The ‘Mental’ and the ‘Physical’’, Minnesota Studies in Philosophy of Science II (1958), p. 466.
3. H. Bergson, Creative Evolution, Random House, New York, 1944, pp. 240–44.
4. William James, The Principles of Psychology, Dover, New York, 1950, pp. 251–2: “Which is to say that our psychological language is wholly inadequate to name the differences that exist…. But namelessness is compatible with existence…”, p. 254: “It is, in short, the re-instatement of the vague to its proper place in our mental life which I am so anxious to press on your attention.” (Italics added.)
5. 1. Cf. my articles 'The Elusive Nature of the Past', in Experience, Existence and the Good, Essays in Honor of Paul Weiss (ed. by Irwin C. Lieb), Southern Illinois Univ., Carbondale, 1961, pp. 130-33