1. Bohr, N., Discussion with Einstein on Epistemological Problems in Atomic Physics, Albert Einstein: Philosopher-Scientist, Library of Living Philosophers. La Salle. III., Vol. V II, 1949.
2. Bohr, N., Faraday Lecture, J. Chem. Soc., 1932, pp. 376 et seq.
3. Clausius, R., Die mechanische Wärmetheorie, 2nd edn., 1876, p. 316.
4. Engels, F., Herrn Euyen Dührings Umwälzung der Wissenschaft (‘Anti-Dühring’), Moscow edn., 1946, pp. 173–4. [See Engels, Anti-Dühring, Part I, Chap 13, first published 1878 — Ed.].
5. Ibid., p. 24.