156 Mr. sme axeman’s Account of 
The interior building or affemblage of nurferies, chambers,, 
See. has a flattifh top or roof without any perforation, which 
would keep the apartments below dry, in cafe through accident 
the dome fhould receive any injury and let in water ; and it is 
never exadlly flat and uniform, becaufe they are always adding 
to it by building more chambers and nurferies : fo that the • 
divifions or columns between the future arched apartments re- 
ferable the pinnacles upon the fronts of fome old buildings, 
and demand particular notice as affording one proof that for the 
moll part the infects projedf their arches, and do not make them, 
as I imagined for a long time, by excavation (tab. VII. fig. 2. b ). 
The area has alfo a flattifh floor, which lays over the royal 
chamber, but fometimes a good height above it, having nurfe- 
ries and magazines between (tab. VII. fig. 2. c.). It is likewife 
water-proof, and contrived, as far as 1 could guefs, to let the: 
water off, if it ihould get in, and run over by fome fhort way 
into the fubterraneous paifages which run under the lowed: ap- 
artments in the hill in various directions, and are of an aftoniih- 
ing fize, being wider than the bore of a great cannon. I have a 
memorandum of one I meafured, perfectly cylindrical, and 
thirteen inches in diameter (tab. VII. fig. 2 . d. d.). 
Thefe fubterraneous paffages or galleries are lined very thick 
with the fame kind of clay of which the hill is compofed, and 
afeend the infide of the outward fhell in a fplral manner, and 
winding round the whole building up to the top interfedt each 
other at different heights, opening either immediately into the 
dome in various places, and into the interior building, the new 
turrets, &c. or communicating thereto by other galleries of 
different bores or diameters, either circular or oval. 
From every part of thefe large galleries are various fmall 
pipes or galleries leading to different parts of the building. 
Under 
