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calls Statitmina. He diredJs them to be fee, when the 
Underwork is made Sound and Firm, by well Ramming. 
Becaufe the firfl: Chapter in his Seventh Book, treats 
only of the Method of making thefe kinds of Pavements, 
which in his rime, and as may be obferv’d from his words, 
were had in no fmall efteem by the Grandees of Reme ; 
I have tranferibed what may fliew the accurate Me- 
thods which that great People had in Framing them. 
But to return, this pitch’d Work was exadUy even 
with the Sct*ofF in the infide of the Wall; on it was 
laid a Bed of coarfe Mortar of about nine Inches thick ; 
the Skirts of this Mortar (which by Vitruvius is call’d 
the Rudus) refled on the Set-ofF above-mention’d ; it 
was compos’d of Lime, a (harp courfe Sand, fmall Peb- 
bles, and bits of Brick. Upon this Rudus was a finer 
Compofition, made, as near as I could guefs, with 
Lime, a fine lharp Sand, fome kind of Afties, and 
(which was the greater part) flampt Brick and Poc-fiicrds, 
in grains not larger than Cabbage»Seed, and the Flower 
or fine Powder feparated from it. This Bed w’as about 
half a Foot thick ; and is what Vitruvius calls the Nucleus, 
Whether we may call it Terrace, I mufl leave it to thofe 
who are better skill’d than my felf, in giving proper Ap- 
pellations to the feveral parts of Mafonry. Both this 
Nucleus and the Rudus under it, very near equall’d the 
TortUrtd>SionQ in hardnels and compadnefs. Upon this 
Nucleus or Terrace were the Teffera fet : they were fet an 
end ; but fb exadi was the Workman in Petting them, that 
he us’d two forts of Cement to fix them withal ; their 
lower ends flood in a Cement of Lyme only, well 
work’d ; their upper halves were cemented with a fine 
gray Mortar, confiding of fine Sand (and as it feem’d) 
Afties and Lyme. This gray Cement every where fill’d 
the Intervals at their Heads ; and was much harder than 
the Teffeya themfelves. ^ 
’Twas, 
