Transmission of Sound 37 Progress of Sound 39 Sound turning Corners 39 To tell the distance of Thunder 40 Hearing by the Touch 40 Conversation for the Deaf 40 Glass broken by the Voice 41 Figures produced by Sound 41 Transmitted Vibration 42 Double Vibration 42 Champagne and Sound 42 Music from Palisades 43 Theory of the Jew’s Harp 43 Music of the Snail 44 To tune a Guitar without the assistance of the Ear 44 Music from Glass or Metal Rods 44 The Tuning-fork a Flute-player 45 Musical Bottles 46 Theory of Whispering 46 Theory of the Voice 46 Sound along a Wall 47 Sounds more audible by Night than by Day 47 Musical Echo 47 Ventriloquism 48