“58 
lobferved to be, if you ftand between a Hou 
251. 
252. 
253- 
254 
| Experiments 
in Confort, 
{touching the 
‘Confene and 
Difjent bee 
tween Vifthles 
and Audibles, 
255. | 
256. 
257: 
| more loud) and fome weaker and fainter. 
YC! 
; " . : 
r 
“Natural Hiftory 5 Fe ee 
The like Eccho upon Eccho,. but i wich two repotts, hath b en| 
C 
and a Hill, and lure towards | . 
the Hill; for the Houfe will give a Back Eccho: One taking it from the | 
other, and the latterthe weaker. | od 
There are certain Levers, that anEccho willhardly exprefs: As $/for| 
‘ohe, efpecially being principalin aword. I remember well, that when | 
I went to the Eccho at ‘Pont-Carenton, there was anold Parifian that took it| 
to be the Work of Spirits, and of good Spirits. For (faid he) call Satan, | 
| and the Eccho will not deliver backthe Devils name: But will fay, Viren, 
which is‘as much in French, as CApage, or Avoid. And theteby'I did hapto | 
finde, thar an Eccho would‘not return §,being but a Hifling and'an Interior | 
Sound: ai) ery Tot | Vi sabe ok | 
Eccho’s are fomemorefudden, andchapagain as foon as the Voiceis 4 
delivered, as hathbeen partly faid; others ar¢ more deliberate, that is, give | 
more {pace between the Voice andthe Eccho, ‘which is caufed by the Local | _ 
nearnefs or diftance? ‘Some will report a longer trainof words, and fome o 
a fhorter:. Some more loud (full as loud as the Original, and {fometimes | 
Where Eccho’s come from feveral parts,at the fame diftance they muft | — 
needs make (as it were) a Quire of Eccho’s,and {o make the Reportgreater, | i 
and even acontinued Eccho; which youfhall finde in fome Hills that ftand | 
encompaffed, Theatre-like.  ) | : oe oe 
— Iedoth not yet appear, that there is Refraction in Sounds, as well asin | 
Species Vifible. Fort do notthink, that if a Sound fhould pafs through di-| 
vers Afediums, as —Alir, Cloth, Wood} it would deliver the Sound in a differing | 
lace, from that unto'which it is deferred ; which is the propereffe@ of 
Refradion. But CMajoration, which is alfo the Work of Refrattion, appear- | 
| ethplainly in Sounds, (as hath been handled at full) butitisnotby diverfity | 
of Mediums. » dbase 
FE have Obiter, for Demonftrations fake; ufed indivers Mmfances, the % 
Examples of the Sight, and Things Vifible, co illuftrate the Nature of | © 
Sounds. But we think good now to profecute that Comparifon more | — 
fully. ! +100 te 
is abby ES 
e os ie * 
POEL he 
Confne of Vibes and Aube, | 
PD Orth of them fpred themfelvesin Round, and fill awhole Flore or Orb | ~ 
unto certain Limits; andare carried a great way, and do languifh and | 
Ieffen by degrees, according to the Diftance of che Objeds from the} 
Senfories. 9:99 
Both of them have the whole Species in every {mall portion of the } 
Air or Medium, foas the Species do pafs through fmall Cranies, without | 
confufion: As we fee ordinarily inLevels, astothe Eye; and inCranies, | 
or Chinks, as tothe Sound. oaks 7s sy ae . rant 
Both of them are of a fudden and eafi ec Generation and Delation, and | 
| 
| 
likewile perith fwiftly and fuddenly; as it y ou remove the Light, or touch] ~ 
the Bodies that give theSound. . | ow i 
S. 
