C 778 ] 
In the year 1742 (5), the Royal Academy of 
Sciences at Paris, at the requefl of the Royal Society 
of London, fent over a meafure of half the toife of 
the Chateletj from which Mr. Graham determined 
the proportion of the Paris foot to that of London, 
to be as 1067,4. if to 1000. Monf. Le Monnier, of 
the Royal Academy ©f Sciences, from the fame ori- 
ginals, found their proportion as 864, to 811, or as 
1067,37 1 to i 000. The difference is inconfidei- 
ab’e, and we may, without injuftice to Mr. Graham’s 
known fk;il and accuracy in thefe matters, fuppofe 
their true proportion to be as 1067,4 to 1000. 
Mr. Graham’s meafure of the London yard, to- 
gether with that of half the toife of the Chatelet, aic 
depofited in the archives of the Royal Society at Lon- 
don, and of the Royal Academy of Sciences at Paris ; 
and whenever I fhall mention the London foot, with- 
out fpecifying any particular ffandard of it, 1 would 
be underftood to mean this meafure. 
In this enquiry, we are to fcek a common mea- 
fure to the feveral parts of each building, that fhall 
not differ very widely from fome aflumed magnitude 
of the Roman foot : and though we might take this 
alfumption from any of the antient foot-rules now 
remaining, yet the nearer it is taken to the tiuth, 
the better guide it will be to us, and the more it 
will facilitate our enquiry. Now, as a mean mea- 
fure, derived from thefe rules, will, probably, be 
nearer the truth, than either the greateff or the leafl 
of them, fo one that fhall include fuch other remains 
of antiquity, as have hitherto been made of to difcovei 
(5) See Philof. Tranf. N° 465. 
the 
