eae ee — 
. Geary 1... 
butrunneth in filence, if itbe of any depth ; but rhe very Strcam upon Shall | 
lows, or Gravel, or Pebble, willbeheard. And Waters, when they-beatup 
} ontheShore, orare ftraitned, (as in the falls of Bridges) or are dafhed againft | 
| themfelves by Winds, give aroaringnoife. Any peece of Timber, or hard | 
Body, being thruft forwards by another Body continguous, without knock-— 
| ing giveth no noife. And fo Bodiesin weighing, one upon another, though | 
the upper Body prefs the lower Body down, makeno noife. So the motion 
of the Minute parts of any folid Body; (which isthe principal canfe of violent. 
Motion, though unobferved) paffeth withoutfound; For that found, thatis | 
heard fometimes, is produced onely by thebreaking of the Air, andnot by 
the impulfion of the parts. So it is manifeft, that where the anterior Body | 
giveth way as faft as the pofterior cometh on, it maketh no noife, be the 
| motion never fo great or {wift. | 
| Air open and at large, maketh no noife, exceptit be (harply percuffed ; 
as in the found of a ftring, where Air is purcuffed by a hard and {tiff Body, and 
withafharploofe: For it the ftring be not ftrained, it maketh nonoile; but | 
where the Airis pent and ftraitned, there breath or other blowing ¢which 
carry buta gentle percuffion) fuffice to crearefound ; asin Pipes and Wind 
Inftruments. But then you mu{ note, that in Recorders which go with a 
gentlebreath; the Concave of the Pipe (were it not for che Fipple thar ftrait- 
neth the Air mtich more then the fimple Concave) would yield no found. 
For, as for ether Wind-Inftruments, they require a forcible breath, as Tram- 
| pets, Cornets, Hunters, Horns, &c. Which appeareth by the blown Cheeksof 
him that windeth them: Organs alfo are blown with a {trong wind by the 
Bellows. And note again, thatfomekinde of Wind-inftraments are blown 
-at a fmall hole in the fide, which ftraineth the breath atthe firft entrance; | 
the rather, in refpect of their traverfe, and {top above che hole which per. | 
formeth the Fipples part ; asit is feen in Plates and Fifes, which will not give 
found by a blaft ar the end, as Recorders do, &c. Likewile in ali Whiftling, 
} you contra& the Mouth ; and to make it more fharp, Men fomeiimes ule their 
finger. il 
' , Burt in open Air, if youthrow aStone ora Dart, they give no found: 
| No more do Bullets, exceptthey happen co be alittle hollowed inthe catt. 
ing 5; which hollownefs penneth the Air: Nor yetArrows, except they be 
ruffled intheir Feathers, which likewile penneth the Air. As for {mall Whi. 
ftles or Shepherds Oaten-Pipes, they give afound, becaufe of their extream | 
flendernicfs, whereby the Airis more pentthanin a wider Pipe. Again, the 
voices of Men and Living Creatures, pafsthroughthe Throat, which pen. | 
neth the breath, As for the Jews-Harp, it isafharp percuffion,and befides hath 
the vantage of penning the Air in the Mouth, 
Solid Bodies, if they be very foftly percuffed, giveno found; aswhena 
‘| Man treadeth very foftly upon Boards. SoChefts or Doors in fair weather, 
when they open eafily, give no found. And Cart-wheels fqueek not when j 
| they are liquored. eit: 
The Flame of Tapers or Candles; though it be a fwift motion and breaketh 
theAir, yet paffeth withoutfound. Airin Ovens, though (no doubt)it doth 
| (as it were) boil, and dilate it felf, and is repercufled, yet it is without aoife. 
; Flame percufed by Air, giveth a noife ; Asin blowing of the Fire by Bel- 
lows, greater thanif the Bellows fhould blow upon the Air it felf. Andfo 
likewife Flame percuffing the Air ftrongly (as when Flame faddenly taketh 
and openerh) giveth anoife : So great Flames, whiiles the one impelleth the 
| other, give a bellowing fouud. AY 
There 
