[48t] 
fpoken, that is, which do laft occurre tt) 'Corpus Ob-^ 
Jians, muft firft be repeil'd ; which cannot be. For 
where in the mean tirnefhouid the firft words hang aild be 
conceal'd or lie dormant Or how, alter fuch a paufe, be 
reviv'd and animated again into Motion f Yet in com- 
plicated or ^0772/76^2/^^ Ecchoej, where many receive from 
one another, 1 know not whether fomething that way- 
may not be done. 
From the determinate Concavity or Archednefs of thefe 
refleding bodies it comes to pals, that fome of them, 
from a certain diftance or pofiture, will Eccho back but 
one determinate Note, and from no other place will 
they revei'berate any 3 becaofeof the undue pofition of 
theSoundmg Body. Such an one ( as I remember j is 
\ the Vault in Merton Coiledge m Oxford, 
As a Speculum takes la and refiecSbs more of it's Ob- 
ied:, whenpiac d at a great diftance from it, then when 
nearer j becaufe it reflects according to the apparent 
magnitude of the body at fuch a diftance, which is lefs : 
So a ' io the Eccho ing body^ being remov'd farther off, 
refiedts more of the Sound, then when nearer.- And this 
is the reaion, why fome Ecchoes repent but one Syllable, 
fome one Word, and fome many. 
As Specula's may be fo plac'd, that reflecting one 
upon or into the other, either dire<flly or obliquely, one 
; Objed: fhall appear many 3 as in Sir Samuel Morlands 
Glals-room: After the fame manner Ecchoing bodies may 
be fo contriv'd and plac d, as that reflecting the Sound 
from one to the other, either diredly and mutually, or 
/ Obliquely and by Succeffion, out of one S®und fliall 
i : many Ecchoes be begotten j wh xh in the firft cafe will be 
Ir all together^ fomewliat in /oW d or fwallowed up of each 
e other ; and thereby conJii /d fas a face in Lookang-glafTes 
}[ ob verted ; ) in the otlier they will be d iftindt, feparate and 
le fucceeding one another ^ as nioft multtple-Ecchoes do. 
||: ' Moreo\^er a A^^?^/i^^/^£^^^£? may be made, by- pta;ce-- 
oJ ■ ■ 
1.1 , - . 
