The Problem of Psychological Measurement By Mr. George H. Mead, University of Michigan.
Measurement is the breaking up of a quantum of energy into equal units.
In undeveloped consciousness we have an original plenum without parts. The number of the rhythmical processes required to attain the object constitutes its temporal character, the sum of them its spacial character, the one being expressed in terms of the other. The finer exact measurements of the mathematical sciences are functions of the coarser measurements which the eye can directly effect. The postulate of such finer measurements is a continuum capable of infinite extension and infinite division. The psychological expression of such a continuum is the mediating activity abstracted from the stimulus.