7.9
Concerning symphony, he shows how sounds harmonize. A quick sound is acute, a slow is grave. Therefore acute sounds move the senses the quicker; and these dying and grave sounds supervening, what arises from the contemperation of one with the other causes pleasure to the ear, which we call harmony. And by what has been said, it may easily be understood that air is the instrument of these things. For sound is the stroke upon the sense of the hearer, caused by the air; and the air strikes as it is struck by the thing moving,—if violent, acutely,—if languid, softly. The violent stroke comes quick to the ear; then the circumambient air receiving a slower, it affects and carries the sense along with it.
Question VIII
8.1
WHAT MEANS TIMAEUS,See Timaeus, p. 42 D. WHEN HE SAYS THAT SOULS ARE DISPERSED IN TO THE EARTH, THE MOON, AND INTO OTHER INSTRUMENTS OF TIME?
8.1
Does the earth move like the sun, moon, and five planets, which for their motions he calls organs or instruments of time? Or is the earth fixed to the axis of the universe; yet not so built as to remain immovable, but to turn and wheel about, as Aristarchus and Seleucus have shown since; Aristarchus only supposing it, Seleucus positively asserting it? Theophrastus writes how that Plato, when he grew old, repented him that he had placed the earth in the middle of the universe, which was not its place.
