[4^8] 
2. If the Sonorous body be placd near ^«^^r the found 
will eafily be convey'd, yet mollified^ as experience teach- 
eth^us from a Ring of Bells near a river and a great 
Gun fliot off at Sea j which differ much in the ftrength, 
and yet foftnefs and continuance or propagation of their 
Sounds, from the fame at land 5 where the Sound is more 
harfh and more perifhing, or much fooner decays. 
- 3.Ina/?//a5;z^a Voicemaybeheard at a far greater di- 
ftance, then in uneven ground. 
Tht l^afdn of all which laft nam'd Pheenomena is the 
fame, becaufe the Sonorous air meeting with little or no 
refifta nee upon z Plane ('much lefs upon an Arch'd ^ 
fmooth fuperficies, eafily rouls along it, without being 
let or hindred in its Motion, and confequently without 
having its parts diifigur'd, and put into another kind of 
Revolution, then what they had at the firft begetting of 
the Sound. Which is the true caufe of its Prefervation or 
ProgreJJion 'y and fails much when the aii' pafles over an 
uneven furface, according to the degrees of its inequali 
ty.and fomewhat alfo, when itpaffes over the plane luper- 
ficies of a body, that is hard and refitting. 
Wherefore the fmooth top of the Water ( by reafon of 
its yielding to the Arch'd air, and gently rifing again 
with a kind of refurge, like to Elajiicity, though it be not 
foj by which refurge it quickens and haftens the motion of 
theair rouling over it, and by Its yielding preferves it in, 
it's Arch'd Cycloidical or Eliptical Figure ) the fmooth 
top of the water, I fay, for thefe reafons, andbythefe 
means, conveys a Sound more entire and to a greater 
diftance , then the plane furface of a piece of ground, a: 
wall, or any other Solid Body whatever can do. 
As for the Speal^ng Trumpet, by wliich a voice may be 
conveyed to a confiderablediftance, I refer it's confide- 
ration to that of J^fralied Sounds or ^fraBed Audition. , 
Thus much of the Improvements of Hearing, that re- 
fpedt it's(?A/cS which is .Jo^^/^rf. 
2. Thej 
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