8 The S\(amral Hifiory 
the oppofite Hill juft without the gate at the Towns end, about 
thirty paces dirc6lly below the corner of a wall inclofing fome 
hay-ricks, near Chancers houfe-- fome advantage I guefs it re-* 
ceives from the rivulet that runs as it were in adireft line between 
the two centers, and from the pond at the foot of the objed 
hill ; as alfo from two other hills that run obliquely up to it ; 
Which may better be apprehended by theprofpeftof the place, 
ZsinTab, I* Fig, 2, 
16, That this £c/;t? makes return of fo many fyllables, and of 
a different number in the day and night, being indifputable and 
matter of faft 5 1 proceed in the next place to thereafons of thefe 
certainties, which poffibly to every body may not be fo plain. 
Firft then, the caufes why fome Echo'^s return mote, and fome 
fewer fyllables, I take to lye in the different diftances of the 
objefts (returning the voices) from the places of the fpeakers : 
for by experience 'tis found, that if the fpeaker be too near the 
objeft, the return is made fo quick upon him, that thc£c^o is as 
it were drowned in the voice : but if he remove farther from it, 
then it begins to be clear and diftind ; and if it be a plyjjlla- 
ileal one, it firft repeats one fyllable, then two, three, four, 
five, or more, according as the fpeaker removes farther off* it * 
which I take to be the only true way of meafuring the proporti- 
ons of the fpaces of the ground, requifite for the return of one 
or more fyllables. That this is true, I fliall ufe no arguments to 
perfwade, becaufe the experiment is fubjeft to every manstryal ; 
and if fo, it muft neceifarily be admitted, that the reafon why 
this Echo returns fo much, is becaufe of the great diftance of the 
objeft from the fpeaker. 
17. Whatdiftance is required to the return of each fyllable, 
is beft indeed determined by fuch a procedure, where the objeQ: 
is fore-known, and the condition of the place will admit of the 
experiment: but both thefe being wanting here (£c/?o's them- 
felves being generally firft known, and not the objefts) I was 
forced to make ufe of a new analytical method, and find out the 
objeft by the number of fyllables already returned, which being 
feventeen in the day time, and twenty by night ; and having be- 
fore found by frequent experience, that according to Blancanu6 
no one fyllable will be returned clearly, under the diftance of 24 
» '&lancam'Echometricilheorm 
' ■ Geome- 
