f 
7 ° 
iSS 
269 
27O 
?7i 
372 
3\Qttural] HiSlory 
DISSENTS OF VISIBLES, 
ancl Audibles. 
T H Ji Spemes of Fifties fecme to bee E mi ft ns of Beamcs from the 
Obiect fihne • Almoft like Odours ; fauethat they are more In - 
corporeall.: But the Species of Audibles (eeme to Participate 
more with Locall Motion ^ like Percuftns or Impreftns madevpon the 
Aire. So that whereas all Bodies doe feeme to workein two manners; 
Either by the Communication of their Natures • Orby the Imprefions and 
Signatures of their Motions *, The Diffufion of Species Fifible feemethto 
participatemoreof the former Operation h andthc Species Audible of the 
latter: 
The Species ot Audibles feeme tobe carried more manifeftly thorow the 
Aire* than the Species of Fifties •* For (I conceiue) that a contrary (hong 
Wind will not much hinder the Sight 0 {Fifties, as it will doe the Hea - 
ring of Sounds. 
There is one Difference y aboue all others, betweene Fftlesa nd Au¬ 
dible* , that is the moft remarkable 5 As that whereupon many fmailer 
Differences doe depend: Namely, that Fifties , (except Lights,) are 
carried in Right Lines 5 and Audibles in Arcuate Lines. Hence it commeth 
to pa lie, that Fifties doe not intermingle, and confound one another, 
as hath beene (aid before ; But Sounds doe. Hence it commeth, that the 
Solidityor Bodies doth not much hinder the Sight, fo that the Bodies 
bee cleare, and the Pores in a Right Line, asinGlaflc, Cryftall, Dia- 
monds, Water, &c. But a thin Scarfe, or Handkerchiefe; though thev 
bee Bodies nothing fo Solid, hinder the Sight: Whereas (contrariwife) 
thefe Porous Bodies doe not much hinder the Hearing, but Solid Bodies 
doealmoft ftopit, or at the lead attenuate it. Hence aKo it commeth, 
thafctfo the Reflexion of Fifties t fmallGlaflesfuifice ; but to the Reverbe¬ 
ration of Audibles, are required greater Spaces, as hath likewile beene’faid 
before. - | 
Fifties are fecne further off, than sounds are heard; Allowing n ;uerthe- f 
lelTe the Rate of their Bigneffc : F or otherwife a great Sound will bee heard 
further off, than a Smalt Body feene. 
Fifties require (generally) fome Dijlance betweene the obieel, and 
the Eye y to bee better feene ; Whereas in Audibles , thencerer the Ap¬ 
proach of the Sound is to the Senfe, the better. But in this there may bee 
a double Errour. The one, becaufe to Seeing , there is required L ight 5 
And any thing that toucheththe Pupillof the Eye (allouer) excludeth 
the Light. For I hane heard ofa Perfon very credible (whohimfelfe was 
aired 
