Qentury II 



39 



Hollow, or Ifle, behind the Wall, and fome Paflage to it towards the fur- 

 ther end of that Wall,againft which you fpeak So as the Voice of him that 

 fpeaketh, flideth along the Wall, and then entreth at fome Palfage, and 

 communicateth with the Air of the Hollow-, For it is preferved iome- 

 what by the plain Wall 5 but that is too weak to give a Sound Audible,, till 

 it hath communicated with the back Air, 



Strike upon a Bow- firing-, and lay the Horn of the Bow near your Ear, 149 

 and it will encreafe the Sound, and make a degree of a T one. The Caufe is, 

 for that the Senfory, by reafon of the Clofe Holding, is perculfed, before 

 the Air difperfeth. The like is, if you hold the Horn betwixt your 

 Teeth. But that is a plain Delation of the Sound from the Teeth, to the 

 Inftrument of Hearings For there is a great Entercourfe between thofe 

 two Parts ; As appearethby this That a Yarftigrating Tune fetteth the 

 Teeth on edge. The like falleth out, if the Horn of the Bow be put upon the 

 Temples ^ But that is but the Slide of the Sound horn thence to the Ear. 



If you take a Rod of Iron, or Bra/, and hold the one end to your Ear, j^o 

 and ftnke upon the other, itmakethafar greater S ound,thm the like Stroke 

 upon the Rod, not made fo Contiguous to the Ear.By which, and by 

 fome other Inftances, that have been partly touched, it mould appear-, 

 That Sounds do riot only Hide upon the Surface of a Smooth Body, but do 

 alfo communicate with the Spirits, that are in the Pores of the Body. 

 I remember in Trinity-Colledge in Cambridge, there was an Upper Chamber, 151 

 which being thought weak in the Roof of it, was fupported by a Pillar of 

 Iron,of the bignefs of ones Arm, in the middeft of the Chamber ; which 

 if you had {truck, it would make a little flat Hoife in the Room where it was 

 {truck -,But it would make a great Bomb in the Chamber beneath. 



The Sound which is made by Buckets in a Well, when they touch upon 

 the Water 5 Or when they ftrike upon the fide of the Well : Or when two 

 Buckets dam the one againft the other 5 Thefe Sounds are deeper, and ful- 

 ler, than if the like-Percuffion were made in the Open Air. The Caufe is the 

 Penning and Enclofureof the Air, in the Concave of the WelL 



Barrels placed in a Room under the Floor of a Chamber, make all Not- 153 

 fes in the fame Chamber,more full and Refounding. 



So that there be five wajes{ingenerallJ)ot Majoration of Sounds t Enclo- 

 fure Simple Enclofure ith Dilatation Communication • Reflexion 

 Concurrent and Approach to the Senfory. 



For Exility of the Voice , or other Sounds : It is certain, that the Voice *54 

 doth pafs thorow Sojidand Hard Bodies , if they be not; too thick. And 

 thorow JF^r which is likewifea very Clofe Body and fuchan one, as 

 lettethnotin Air.But then the Voice, or other Sound, is reduced, by iuch 

 paflage,to a great Weaknef, or Exility. If therefore you ftop the Holes of a 

 Hawkes Bell, it will make no Ring, but a flat Noife,or Rattle. And fo doth 

 the JEtites or Eagles Stone,which hath a little Stone within it. 



And as for Water, it is a certain Triall : Let a man go info a Bath-, and *55 

 take a Pail> and turn the Bottome upward , and carry the Mouth of it 

 ( EvenJ down to the Levell of the Water, and fo prefs it down under the 

 Water, fome handfull and an half, Ml keeping it even, that it may not tilt 

 on either fide, and fo the Air get out: Then let him that is in the Bath, dive 

 with his Head fo far under Water, as he may put his Head into the Pail, and 

 there will come as much Air bubling forth, as will make Room for his 

 Head. Then let him fpeak, and any that mall ftand without,> (hall hear his 

 Voice plainly but yet made extreme {harp and exile, like the Voice of 

 ___ Puppets: ^^^^ 



