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The Ruins of two old Towers dill remain, one of 
which (food on the North Side, and the other at th« 
Weft End ; the laft of which is at prefent the mod 
confidcrable of the two. They were both built in 
a manner perhaps peculiar to the Romans at that 
Time, and which it may not be improper to dc- 
feribe. They began firft with a Layer of Bricks laid 
flat as in Pavements ; on that they placed a Layer 
of Clay and Marie mixed together, and of the fame 
Thicknefs as the Bricks ; then a Layer of Bricks, 
afterwards of Clay and Marie, then of Bricks again, 
making in the whole three Layers of Bricks and two 
of Clay : Over this were placed Bricks and Lime 
29 Inches, the Outfide being faced with Bricks cut 
in Squares (like the modern Way of Building in fome 
Parts of Norfolk ), then Bricks and Clay again Stra- 
tum fuper Stratum , as high as the old Ruins now 
remain (landing. 
The Mortar is found cxtrcamly hard at this Day : 
It is a Compofition of Lime, Sand, and Afhes, 
and fo compact that 1 could by no Means break a 
Piece of it of an Inch Diameter from the Bafe of 
one of the Towers at theEaft Gate, but on ftriking 
it with a {harp Flint it flew off in Duft. 
The Roman Bricks which I examined, were made 
of two different Sorts of Clay mixt ; when burnt 
one appears red and the other white : At the Time 
of my viewing them they were exceeding hard and 
folid, and far fuperior to any thing of the Kind 
now made with us. Perhaps they are little worfe 
than when they were firft laid down. 
Thcfe Bricks were made without the Afllftance 
or Addition of Sand, as is too much th£ Practice at 
C c prefent 
