Century IT 



\ in the Thrufting out, or Drawing in of the Chin, when we Zing. 

 I The Mumming of Bees, is an Unequal E nzzing, and is conceived,by fome 

 ' of the Ancients, not to come forth at their Mouth, but to bean Inward 

 Sound : but (it may be) it is neither but from the motion of their Wings 

 For it is not heard but when they ftirre. 

 ! All Metalls quenched in Water, give a Sibilation or Hifling found ("which 

 hath an Affinity with the letter Z.) notwithftanding the Sound be created 

 I between the Water or Vapour, and the Air. Seething alfo, if there be but 

 i fmall ftore of Water, in a Veffell, giveth a Hifling Sound ; but Boyling in a I 

 | full YelTell, giveth a Bubling Sound, drawing fomewhat near to the Cocks 

 | ufed by Children. 



Triall would be made, whether the Inequality, or Interchange of the Me- 

 | ^/».«2,will not produce an Inequality of Sound; as if three Bells were made one 

 within another, and Air betwixt each ^ and then the outermoft Bell were 

 chimed with a Hammer, how the Sound would differ from a Simple Bell. So 

 likewifetakea Plate of Brafi, and a Planck of Wood, and joyn them clofe 

 together, and knock upon one of them, and fee if they do not give an u#e- 

 qiiall Sound, So make two or three Partitions ot Wood ma Boghead, with 

 Holes ox Knots in them And mark the difference of their Sound, from the 

 Sound of an Hogfiead, without fuch Partitions. 



IT is evident, that the Percufion of the Greater Quantity of Air, caufeth 

 the Safer Sound ; And the lefs Quantity , the movPffebble found. The Per- 

 cufton ot the Greater Quantity of Air} ^produced by the Greatnef of the 'Bo- 

 by the Latitude of the Concave, by which the Sound pafleth ; 



dy.Percuf 



and by the Longitude of the fame Cwz^n^.Therefore we fee that a Bafe firing, 

 is greater than a T rehle A Bafe Pipe hath a greater bore then a T rebbfe-,And 

 in Pipes, and thelike, the lower the Note Holes be, and the further offfrom 

 the Mouth of the Pipe, the more Bafe Sound they yeeld ; and the neerer the 

 Mouth the more T rebble. Nay more,if you ftrike an Entire Body, as an An- 

 diron of Brafi, at the Top,it maketh a more T rebble Sound \ and at the Bot- 

 tome a Bajer. 



It is alio evident, that the Sharper or Quicker Percufjion of Air caufeth the 

 more Treble Sound,and the Slower or Heavier, the more Bafe Sound. So we 

 fee in Strings. \ the more they are wound up,and ftrained •, ( And thereby give 

 a more quick Start back the more T rebble is the Sound. And the Hacker 

 th.yare, or lefs wound up, the Bafer is the Sound. And therefore a 

 bigger String more ftrained, andalefler String, lefs ftrained, may fall into 

 the fame Tone. 



Children, Women, Eunuchs have more fmall and thrill Voices, than Men. 

 The Reafon is, not for that Men have greater Heat, which may make the 

 Voice ftronger, ( tor the ftrength of a Voice or Sound, doth make a difference 

 in the Lcudnefiov SoftneJf,bm not in the Tone but from the Dilatation 

 of the organ ^vhich (it is true) is likewife caufed by Heat. But the Caufe of 

 Changing the Voice, at the yeares of Puberty,is more obfcure. It feemeth to 

 be, for that when much of theMoifture of the Body, which did before ir- 

 rigate the Parts, is drawn down to theSpermaticall veflels it leaveth the 

 Body more hot then it was whence cometh the Dilatation of the Pipes : 

 For we fee plainly, all Fffecls of Heat.dothen come on ; As Pilofity, more 

 Roughnefs of the Skin,Hardnefs of the Fle(h,&c. 



The Induftry of the Mufictan, hath produced two other Means of Sty ain- 

 in<r,ox Intenfion of Strings, befides their Winding up. The one is the Stopping 



of 



175 



176 



*77i 



Experiments 

 in Confort 

 touching the 

 more trebble, 

 and the -more 

 Bafe Tones, or 

 Mttficall 

 Soun is. 

 178 



I 7 p 



l8o 



III 



