Systrum of the Egyptians , and the like) that beget (and not only propagate) Sounds; the Skill of making these, I say, is an Art, that has as much improv'd Direct Hearing , as an Harmonious Sound exceeds a single and rude one, that is, an immusical Tone ; which Art is yet capable of farther improvement. And I do hope, that by the Rules, which may happily be laid down concerning the Nature , Propagation and Proportion , or Adapting of Sounds, a way may be found out, both to improve Musical Instruments already in use, and to invent new ones, that shall be more sweet and luscious, than any yet known. Besides that, by the same means Instruments may be made, that shall imitate any Sound in Nature, that is not Articulate, be it of Bird, Beast, or what thing else soever.
- The Conveying and Propagating (which is a kind of Conserving) of Sounds, is much help'd by duly placing the Sonorous Body, and also by the Medium.