The ^^(amral Hi/lory 
three of the furtheft muft needs be out of the voices aftion, 
26. Much lefs fure can any fingle objeft perform this, and yet 
jfacobu^ Boiffardfi6^ in his Topografhy of Rome^ reports this to be 
true upon his own knowledge. On the Appian way (faies he) 
amongji many other vafl ruins^ which fome think, to have been ths 
Cafile wherein the Praetorian Soldiers lay^ there are many Sepulchers; 
chtufe and [olid Pyramids, istc» But the mo§i eminent is of a round 
form, made of fquared white Marble^ like a Tower ^ hollow within 
and open at the top^ ereSied in memory of Caecilia Metella : it fiands 
in the corner of another wall^ in whofe circuit there are carved in Mar^* 
hle^ near 200 Bulls heads^ whence 'tis called. Capo di Boi. At 
the foot of the hill where this Tower [lands, if any man pronounce an 
Heroic Verfe, a wonderful Echo there is, that returns it often entirely 
and articulately : I my felf, fays he, have heard it repeat the firfl 
Verfe of Virgils ^neids diftin6lly eight times, and afterward often 
broken and confufedly. Noplace in the World yields the lih Echo 
isc. And what if I add, nor that neither, fincc befide the natural 
impoflibility of the thing, the induftrious Kircher, after he had 
ufcd all imaginable care in the queft of it, came away unfucccfs- 
ful, and found no fuch matter *. 
27. But though we have no confiderable Tautological Echo'^s^ 
by a fimple refleftion, yet we have others of no inferior account 
made by a double one, which alfo arifmg from divers objedls, 
though in a different manner, belong to this place. Of thefe, 
though there are fcarce any that will return a Tr ijly liable, occ2{ion- 
ed, I fuppofe, by the nearnefs of the fecondary objefts, yet a clap 
with the hands or ftamp of the feet, there are fome wnll re- 
turn eight, nine, or ten times, the noife dying, as it were, and 
melting away by degrees with fuch a trembling noife, that I fom- 
time thought of the Epithet \jremuloui] to difcriminate this fort 
of £c/?»o from the reft. 
28. At Heddington, in the Garden of one M*" Pawling Mercer 
of Oxom there is a wall of about 40 yards long, built for the 
advantage of the Fruit, with divers Niches ; to which, if you 
ftand but a Httle obliquely, fo as to fee the Feers ftanding out be- 
tween each two of them, you have the feveral objefts of fuch an 
Echo, not above nine or ten foot diftant from each other, which 
return a clap with the hand, or a monofyllahle (the wind being 
* Janifacob. Boifardh Topographl»'Roma-,f . 6')y66. * Magia Fhonocampticaj Traluf.2. 
quiet 
