( 500 ) 
cient Fort o^Gejjoriuum to have been Boulogne^ whereas 
by Ptolemfs pofition, it mud: be either Dunkirk^ or Gra- 
velinguc^ but the former moft likely, both by the di- 
ftance from the "Ituqv clytepv* being about 20 Miles or 
half a degree of Longitude to theEaft, or f of the whole 
CmQ: of Flaxdcrs, which he makes but a degree and 
quarter from the Ac'ren Irion to the mouth of the Scheld 
which he calls Ofiia Tabuds : asalfo for that Pliny I.4.C.16. 
fp caking of Geforiacum, fays the Proximus Trajeftus into 
Britain, from thence 'is 50 Miles, which is too much 
unlefs Gefforiacum were fomething more Eafterly than 
Calis x Dion Cajjius makes the diftance between France 
and Britain 45-0 ftadia. or 56 Miles, and fays like- 
wife 'tis the ncareft, to ai/MnyJjTarruy. But this is in part 
amended by the explication given in the Itinerary of 
Antonmus^ where the fpace between Gefjoriacnm an<J Ru- 
tupium is {aid to be 450 fiadia, (for this was the ordina- 
ry paffage of the Remans into Britain,) Rutupium being 
more Northerly and GeJJoriacum more Eafterly than 
the termini oi Cefar s Voiage,and confequently the diftance 
greater than 30 Miles which Cefar had obferved : and now 
lately an accurate Survey has proved the diftance between 
Land and Land to be 26 Englifh Miles or 28^ Reman 
Miles > which (hews how near Cefars eftimate was to the 
truth. 
A farther Argument ( but not of equal force withthe 
former becaufe of the modernnefs of the Author, who 
writ above 250 years after) may be drawn from the words 
of Dion CajJiitS) where he fays &kc?-v ^vd ir^i^u^vm^ 
ttAsiW my*** ^^/jwc&r,that after his firft Anchoring he 
Sailed about a Promontory to the place where he Landed ; 
now there are no other Promontories on all that Goaft 
but the South Forelaxd and Dengy efs^ the latter of 
which it .could not be, 'becaufc .cVj^r (ays he Sail'd but 
8 miks, and the Nefs :t fclRs about io! Miles from the 
South and neareft end of the Chalh^Chp r fay the^own 
