lar fuftaining the Arches 4 fathom i there will be then 
on the fide oi Mantenon 33 liagle Arches, afterwards 
71 double ones ; ( as having one Arch upon another ) 
then 4<5 treble ones, which will generaily be zi6 foot 
6 Inches high, ( vi^. up to the floor of the Channel ) 
afterwards 72 double ones ^ then 2o|fihgte, which wiU 
reach to the Mound of Earth, that is to be 5*0 foot high. 
From the ground up to the fecond ^w^^^ are 16 fa- 
thom, from the fecond to the third, or upper Arcade^ 
are 14 fathom, ( which Arcades are double in number 
to thofe they ftand upouj ) and 6 fathom 6 Inches more, 
to the floor of the Channel, which will at leafl: be 6 
foot high, befides the Parapet. 
The Pillars by the ground are 8 fathom thick, but 
what with the Slopes, and ihortnings, which are made 
in every ftory j the Top where the Channel goes, will 
be but 20 foot broad.- there will likewife be at each 
Pillar, a Buttrefs jetting out one fathom, and 2 fathom 
wide. 
Tho' the foregoing - Obfervations were made by a 
very Intelligent perfon, well skilled in things ol this 
Nature, as being no fl:r anger either to the writings of 
the AntientSj, or the Famous Ruins and Remainders 
of their Fabricks in Italy^ and other places : yet he 
profefles himfelf lurprized with the greatnels oi this 
undertaking at Ferfaille, and Mantenon ; for the Mag- 
nificence of the defign, the number of Labourers, the 
exceffivenels of the Expence, and the admirable beauty 
of the Work, 
L 1 1 
