[ 79 ° ] 
{hewn to be lefs than Graham s $ therefore, I think 
a cubic inch of Graham’s meafure of the water of 
Trevi, cannot weigh lefs than 253 Troy grains. This 
will reduce xAuzout’s two meafures of the congius to 
204,35 and 203,43? cubic London inches; which 
give 5? 8 1,7 and 5)80,3 for the meafure of the Roman 
foot. 
Greaves meafured the congius with millet feed (2), 
and comparing it with our mealures of capacity, 
found it to contain y\ pints wine meafure, and 
pints corn meafure. When he wrote, the wine 
gallon was univerfally allowed to contain 231 cubic 
inches (3); and the dimenfions of the bufhel were 
published yearly, by the Lord Mayor of London, 
to be ip inches in diameter, and 7! in depth (4). 
But Greaves’s inches were according to the iron 
ftandard in the Guildhall, and were 2 parts in 1000 
Shorter than Graham’s. Therefore reducing thefe 
meafures in that proportion, the wine gallon will be 
found to contain 2 2p,62 cubic London inches, and 
the corn gallon 264,22. . Hence by the wine mea- 
fure, the congius contained 204,5 cubic London 
inches, and by the corn meafure 203*7 5 which give 
5)8 1 ,p and p8o,6 for the meafure of the Roman 
foot. 
Thefe meafures agree fo well with thofe of Au- 
zout, that I think a mean between them mull be 
very near the truth, and that we may reckon the 
(2) Greaves, note f. p. 303. _ 
(3) See Wybard’s Ta&ometria, p. 264. Oughtred s Circles 
©f Proportion, p. 57. who quotes Gunter and Briggs for the fame 
©pinion. 
(4) Wybard’s Ta&ometria, p. 282. 
foot* 
