10 The ^H^tural Hijlory 
above the objeft, the Echo is beft heard in the valley isr vice 
verfa. All which, rrtay be well enough made out by throwing a 
ball againft a wall, to which, if it be thrown in an oblique line, 
it returns not to the thrower but to another place ; and though 
the projicient do fo throw it, that it ftrikes at right angles with 
the wall, yet (like as in the voice) if heftand too far ofF, it will 
fall as much too (liort in the rebound, as it will exceed if he 
ftand too near. 
I 8. According to thefe grounds I carefully examined this 
Echo^ and found, upon motion backward, forward, and to each 
hand, the vcwq centrum phonicum^ or place of the fpcaker, to be 
upon the hill at Woodficck. towns end, about thirty paces below 
the corner of the wallaforefaid, direftly down toward the Kings 
Majejiies Manor : from whence by meafure to the brow of the 
hill, on which my Lord RocheJIers Lodge ftands, are 45^ Geo- 
metrical paces, or 2 2 8 o feet ; whicK upon allowance of 24 Geo- 
metrical paces, or 120 feet to each fyllable, to my great fatisfa- 
ftion I found to be agreeable to the return of 1 9 fyllables, z/i^. 
one fewer than it returns in the night, and two more than in the 
day. 
19. The meafure I muft confefs had been mtich rhorc eafie 
and natural, could I have began from the objeft, andfo removed 
backward accordingly as the Ecbo gradually inereafed in the repe- 
tition of more fyllables ; for then I could have given the due 
proportion to each, if I had found any inequality upon the in- 
creafe, which I guefs there may be, becaufc the allowance of an 
equality feems to fet the objefttoo far off by a fyllable or two. 
But it not being feafible in this place, I was forced to take the for- 
mer courfe ; for in the valley between the two hills, being the 
whole medium through which the voice pafTes, and the Echo re- 
turns it, there isfcarceany fuch thing asan fic/'o to be found ; 
nay, if you ftand at the Manor it felf, which is not far from the 
true place of thefpeaker, and fituate almoft as high, and dired 
your voice toward the place of the objed, you (hall not have the 
leaft return ; whence 'tis moft evident that ! could not ufe that 
procedure here, and therefore muft defire to be held excufed 
from giving the proportions of fpace, which I fuppofe, accord- 
ing to Kircher^ may decreafe, according as the number of fyl- 
t Magi a Vhonesavi^tiea-i protL 5. 
lables 
