There is thus involved more than averbal shift if we say that the new scientific development effects an exchange of reason for intelligence. In saying this, "reason" has the tech- nical meaning given to it in classic philosophic tradition, the nous of the Greeks, the mtellectus of the scholastics. In this meaning, it designates both an inherent immutable order of nature, superempirical in character, and the organ of mind by which this universal order is grasped. In both respects, reason is with respect to changing things the ultimate fixed standard the law physical phenomena obey, the norm human action should obey. For the marks of "reason" in its traditional sense are necessity, universality, superiority to change, domination of the occurrence and the understanding of change.