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Published online by Cambridge University Press: 14 March 2022
1 The inclusion of neutrinos along with quanta and wave-motions, of photons along with lines of force and neutrinos, and of quanta along with photons and wave-motions seems highly questionable because it disregards completely the difference in “existential status” and in the roles assigned to these “entities” in modern physics. But I shall not press the point.