 In this passage it is clear that Bohr takes quantum mechanics to be a universal theory. Despite the statistical agreement of results in this limit, the physics of the frequencies and intensities, for example, remains different, and Bohr is insistent that it is the quantum account that is the strictly correct one—even in this high \(n\) or “classical” limit. Hence, when Bohr discovered that the allowable quantum transitions are those for which there is a corresponding harmonic in the classical motion, what he had discovered was something about quantum theory.