[ 496 ] 
agreement of its capacity deduced from his weights, 
with Greaves’s meafure,by Millet (6), is a proof of their 
being very near the truth. 
Auzout’s greater weight was 63024 Paris grains, 
equal to 516994. Troy j his lefler, 62760 Paris grains, 
equal to 514824. Troy (7). It is not laid, at what 
time of the year either of thefe weights was taken ; 
but the heat in fummer, and the cold in winter, 
might have made a much greater difference between 
them. 
The mean between both is 51591 Troy grains, 
which, divided by 10, give 5159 -Vfuch grains for 
the weight of tl^dncient Roman Pound. 
Fabretti infiffs, that this veffel ought to have been 
filled up to the brim (8) j but the part above the 
neck feems to have been defigned, either to prevent 
the liquor from fpilling when poured out, or for a 
fccurity againft the diminution of the flandard, which 
Ibch a finifhing rendered imprafticable. 
Several objedions have been made to this Pound 
derived from the Congius, of which the following 
are the moft material. 
Firft, whereas the fide of the Quadrantal contain- 
ing 8 Congii, fhould be equal to the Roman Foot; 
the fide of a cube, containing 8 times this veffel, 
exceeds the moft authentic meafures of that foot now 
remaining. But, as this relation of the two ftandards 
to each other was of an ancient date, when all work- 
(6) See Philofoph. Tranf. Vol LI. p. 790. 
(y) Divers ouvrages de Mathematique & de Phyfique par 
Meir. de 1’ Academic Royale, Paris, 1693, in folio, p. 366. 
371. 
(8) Fabretti infeript. p. 527. 
mznfhip 
