“... during the last two decades, there has been introduced into physical methodology a principle of utmost philosophical importance, easily rivaling that of relativity, and, in some respects, indeed that of causality. Discovered by Pauli in 1925, it immediately elucidate a whole realm of physical facts and was accepted by physicists with wide acclaim. Called the exclusion principle—or Pauli principle, or principle of anti-symmetry—it was embodied in the axiomatics of quantum mechanics; its pecular methodological significance passed out of view.”