Qentury II. 



4-5 



the tune of their Bells. So that Enquiry may fave Triall, Surely, it hath 

 been obferved by one of the Ancients, tnat an Empty Barrell knocked upon 

 with the finger, giveth a Diapafon to the Sound of the like Barrell-full - 7 But 

 how that mould be,I do not well underhand i For that the knocking of a 

 Bar re 11, Full or Empty , doth Icarce give any T one. 



There is required fome fenfible Difference in the Proportion of creating 

 a Note, towards the Sound it felf, which is the Paffive : And that it be 

 not too near, but at ,a diftance. For in a Recorder, the three uppermoft 

 Holes,yeeld one T one 5 which is a Note lower than the T one of the firft 

 three. And the like (no doubt) is required in the Winding or Stopping 

 of Strings. 



There is another Difference of Sounds^ which we will call 

 Exter tour , and Interiour. ft is not Soft> nor Loud: Nor it is not 

 Bafty nor Jrsbk : Nor it is not Mvficall , nor ImmuficaU > 

 Though it be tue, that there can be no Tone in an Interiour 

 Sound t But on the orher fide, in an Exteriour Sounds there 

 may be both MuficaU and Iramuficall. We (hall therefore 

 enumerate them, rather than precifely diftinguiGi them 5 

 Though ( to make feme Adumbration of that we mean ) 

 the Inteiiour is rather an Impwfion or Contufion ©f the Aire, 

 than an Elifion or Se&ion of the fame. So as the Percufiion of 

 the one ; towards the other, differed), as a Bhn> differeth from 

 a Cut. 



In Speech of Man, the Whifyering^ which they call Sufurrus in Latine, ) 

 whether it be louder or fofter, is m Interiour Sound But the Speaking out, 

 is an Exteriour Sounds And therefore you can never make a T one^nov (ing in 

 Whimpering, But in you may .-So Breathing, or Blowing by the Mouthy 

 BeUomsjx Wind, (though lowd) is an Inter iour Sound -,But the Blowing tho- 

 row a Pipe,oi Concave, though foft)is an Exteriour. So likewife the greateft 

 Winds, if they have no Coarctation, or blow not hollow, give any Interiour 

 Sound; The Whirling or hollow Wind yeeldeth a Singing, or Exteriour 

 Sound ; The former being pent by fome other Body 5 The latter being pent 

 iaijy his own Denfity : And therefore we fee, that when the Wind bloweth 

 hollow, it is a Sign of Rain. The Flame, as it moveth within it felf, or 

 is blown by a S^/W^giveth a Murmur or Interiour Sound. 

 . There is no Hard Body, but ftruckagainft another Hard Bod), will yeeld 

 an Exteriour Sound, greater or letter: Infomuch as if the PercufTion beo- 

 ver-foft, it may induce a Nullity of Sound But never an Interiour Sound 3 

 As when one treadeth fo foftly,thathe is not heard. 



Where the Air is the Percutient, pent, or not pent, againft a Hard Body, 

 it never giveth an Exteriour Sound - 7 As if you blow ftrongly with a Bellowes 

 againft a W r ail. 



Soundsiboth Exteriour and Interi our, )mzy be made, as well by Suction, as 

 by Emifion of the Breath ? As in Whirling, or Breathing. 



It 



