STRANGER: The next step clearly is to divide the art of measurement into two parts, as we have said already, and to place in the one part all the arts which measure number, length, depth, breadth, swiftness with their opposites; and to have another part in which they are measured with the mean, and the fit, and the opportune, and the due, and with all those words, in short, which denote a mean or standard removed from the extremes.
