[64] The questions thus far listed occur in the order of mention in the following chapters: 6, 7, 10, 11, 20, 12, 30, 36, 37, 38, 39, 40, 46.
[65] Quest. nat., cap. 31.
[66] Quest. nat., cap. 21.
[67] De architectura, V, iii, 6 (Morgan’s translation). “Voice is a flowing breath of air, perceptible to the hearing by contact. It moves in an endless number of circular rounds, like the innumerably increasing circular waves which appear when a stone is thrown into smooth water, and which keep on spreading indefinitely from the center unless interrupted by narrow limits, or by some obstruction which prevents such waves from reaching their end in due formation. When they are interrupted by obstructions, the first waves, flowing back, break up the formation of those which follow.”
[68] Quest. nat., cap. 22.
[69] See above, chapter 5, vol. I, page 191.
[70] Quest. nat., cap. 23.
[71] See above, chapter 28, I, 659.
[72] See above, chapter 28, I, 657.
[73] See above, chapter 3, page 107.