When the Mathematician told the Historian that he had better let bygones be bygones, he meant that History was of no value; and it is of no value unless it can guide us in the present or future. There may be some guidance for us to gain from a retrospect of the old scales, though in one sense there is nothing new to be said. Most musicians have never heard even a single justly tuned chord, and have quite vague ideas as to what the ideal scale is, or sounds like. There is a loose general idea that quartet players, and unaccompanied singers drop into just intonation, as Wegg dropped into poetry, and that the result is very beautiful.