i6 7*he ^Mural Hijlory 
But herein let it be noted, that I am not fo fanguine as to exclude 
all fears that it may be otherwife, but only fuggeft what feems 
moft probable atprefent, cum animo revocandi^ whenever I fliallbe 
better informed by another, or my own future experience. 
30. At New College in the Cloyfters, there are others of thi^ 
kind, to be heard indeed on all fides, but beft on the South and 
Wejl^ becaufe on thofe there are no doors either to interrupt or 
waft the found : Thefe return a ftamp or voice, feven, eight, of 
nine times, which fo plainly is occafion'd by the /^e^^rj between 
the windows, that on thtWeJi and fliorter fide (being but 38 
yards long) the returns are more quick and thicker by much than 
oni\it Souths where the primary objeQ: being above fifty yards 
removed from the corpus fonorum, and the fecondary ones propor- 
tionably further ^ the returns are much flower and more diftinft, 
in fo much that on that fide the Echo will return a di0llable,whev€^ 
as on the fide you can have but a monofyllahle only. If it 
be objeded, that according to the rule, 3 8 yards are not enough 
for the return of a monofyllahle ; I anfwer, that though it may 
be likely enough that the return of the primary objefl: on that 
fide is not heard, yet that there is none of the fecondary ones, or 
Peers between the windows,but what are diftant from the fpeak- 
er above 40 yards, and therefore may well return z monofyllahle.' 
And if again it be objected, that the interval of an Echo muft be 
liherum and patens *, and it be further dem.anded how it comes a- 
bout that we have fuch Echo''s in Cloyfters, when we can have 
none in wells that are cover 'd with houfes, becaufe the interval 
is clofed at both ends, as this Cloyfter is : It muft be anfwered, 
that that rule holds only in narrow intervals clofed up on all fides, 
and not in fuch Cloyfters that are open and arched to the top ; 
Which may alfo be thereafonwhy at Magdalen College^ where 
the Cloyfters are covered with a flat roof, they have but an in- 
confiderable Echo^ and at Corpus Chrijiinont at all ; notwithftand- 
ing they have all other conditions requifite. 
31. In the Cloyfter at All-fouls College , in the iVor/y^ and IVeJl 
fides, where no doors hinder, there is much fuch another, which 
to the ftamp of ones foot, or clap with the hands, anfwers four 
or five times, with a noife not unlike the ftiaking of a door, and 
in nothing differing from the former, but that to the voice it 
* Bla7icani Echimitria^ Iheoretnate^ 4- 
makes 
