6% 
*53 
254 
3\(aturall HiUory: 
Experiments 
In Conforc 
louching the 
Confent and 
Diffent between 
Vifibks and 
Mdibjf). 
255 
* 5 * 
257 
2 58 
25 9 
£«MiI,andfometimes more loud;) And fome weaker and fainter. 
Where Eccho's come from feuerall Parts, at the fame dillance, they 
mull needs make (as it were) a Quire of Eccho's , and fo make the Report 
greater, and euen a Continued Eccho ; which you fhall finde in fome Hills, 
that ftand encompafTed, Theater-like. 
It doth not yet appear^, that there is Refraction in Sounds , as well as 
in Species Vifible, For I doe n Ahinke, that if a Sound fhould pafle thorow 
diuers Mediums , (as Aire, Cloth, wood) it would deliuer theSoundinz 
differing Place, from that vnto which it is deferred; which is the Pro¬ 
per Effed of Ref ration. But Miration , which is alfo ttie Worke of Re¬ 
fraction > appeareth plainly in Sounds (as hathbeene handled at full •) But 
it is not by Diuerfity of Mediums . 
Wc haue obiter, for Demonftrations lake, vfed in diuers 
Infiances , the Examples of the Sight, and Things Vifible, to ll- 
luftratc the Nature of Sounds. But we thir.ke good now to 
pofccute that Comparifon more fully. 
CONSENT OF VISIBLES, 
and Audibles, 
is. So 
B oth of them (j>read themfelues in Round, and fill a whole Floareor 
Orbe, vnto certaine Limits: and are carried a great way: And 
doelanguifli and lelfenby degrees, according to the Diftanceof 
the Obieds from the Senfories. 
Both of them haue the whole Species in euery fmall Portion of the Aire, 
or Medium ; So as the species doe pafle thorow fmall Crannies, without 
Confufion: As we fee ordinarily in Leuels, as to the Eye * And in Cran¬ 
nies, or Chinks, as to the Sound. 
Both of them ate of a fudden and e a fie Generation aed Delation *, And 
likewife perijh fwiftly , and fuddenly • As if you remoue the Light • Or 
touch the Bodies that giue the Sound. 
Both of them doe receiue and carry exqaijite and accurate Differences ; 
As of Colours, Figures, Motions, Diftanc^, in Vifibles • And of Arti¬ 
culate Voices, Tones, Songs, andQuaucrings, in Audibles. 
Both of them in their Vertue and Working, doe norappeare to emit 
any Corporall Subfiance into their Mediums , or the Orbe of their Vertue • 
Neitheragainetoraife or ftirany euidentlocallMotion in their Mediums , 
as they pafle; but onelyto carry certaine Spiritual Species ; Theperfed 
Knowldgeof the Caufe whereof, being hitherto fcarcely attained, we 
Ifeall fearch and handle in due place. 
Both of them feeme not to Generate or produce any other Effect in Na¬ 
ture, 
