[ 8og ] 
anfwers to a foot of 5*68 parts, that of Faunus to one 
lefs than 5)67. 
The amphitheatre of Vefpafian. 
The plan of this building is elliptical ; and the area 
in the middle being allotted to the exhibition of the 
fhews, feems to be the part on which the magnitude 
of the whole depended. Therefore one of its axes 
mud; be the prime meafure. 
The greater axis meafures 263 feet 11 inches, = 
281176,8 London parts; the leffer 165 feet 1 inch, 
= 1 75879,7. Thefe numbers are fo nearly in the 
proportion of 8 to 5, that there is little reafon to doubt 
their being intended for it. 
The only two whole numbers in this proportion 
that will anfwer our purpofe are 288 and 180, by 
which the greater axis will give 5)76,3 London parts 
for the meafure of the foot; the leffer, 5*77,1. 
Either the diftance from the inner to the outer wall, 
or that from the inner wall to the extremity of the 
upper ftep, was probably a prime meafure too. The 
former is 155 feet 53- inches, = 165610,5; which, 
divided by 170, gives ^74, 2. The latter is 158 feet 
O77 inch, ~ 168340,6; which, divided by 172, 
gives 5)78,7. 
But the axes will admit of other divifors, which 
are in my opinion as probable at lead, as thofe above- 
mentioned. For if we fuppofe the greater axis to have 
been the prime meafure from which the leffer was 
determined in the proportion of 5 to 8, and affume 
2510 Roman feet for it (which is a more probable 
meafure than 288), the leffer axis mud then be 
18 1 ~ fuch feet. And the meafure of the foot by 
the 
