[ 788 ] 
Greaves fays, the Coflutian foot exa&ly agreed 
with fome very antient and perfect Roman feet in 
brafsj and from his companion of two that differed 
from it (which feem to be the greateft and lead; he 
had met with), one of them appears to contain nearly 
£72$ London parts, and the other 962-} (5). 
P. Revillas has given the meafures of three foot- 
rules of an uncommon length ; one of which con- 
tains 972 London parts, another 976, and the third 
5)83 (6). 
There are many more of thefe rules in being, that 
we have no account of; lor mod of the writers on 
this fubjedt, preferring the authority of the marbles, 
have been negligent in their accounts of the foot- 
rules ; therefore I think a mean meafure from thefe 
above-mentioned of no great authority, efpecially as 
fome of them have been produced only on account 
of their difference from the more common meafure 
of the reft. 
If a cubic Roman foot contained a quadrantal of 
wine, the cube of half a foot muft have contained a 
congius, which was the eighth part of the quadran- 
tal. Paetus, Villalpandus, and Auzout meafured the 
ftandard congius of Vefpafian with water ; and have 
(5) Greaves, p. 222. But, p. 227. he fays, there is not one 
of ten meafures of the Roman foot (befides thofe on the monu- 
ments), that arrive to the proportion of that deduced by Villalpan- 
dus from the congius, by 27 parts in 200c ; whereas the greater 
of the two here mentioned contained 9741 parts of his London 
foot, and he makes the foot from the congius of Villalpandus, hut 
986 fuch parts; their difference is but 23 two thoufandth parts of 
the latter. 
(6) Saggi di Dift Academ. di Cortona, vol. iii. 
given 
