C 4080 ) 
Same Jddhions to the Narrative, that was fublijy d Numb. 58. 
about the ConjmBion^ of the Ocean and ^^Mediterranean by 
a Channel in France \ In which Additions the Progreji and 
the deftgnedUjefulneJ^of that gr tat Undertaking are more 
amfly reprefcnped: Out of a French Letter, written by 
(l^lonjieur dG Vroidour to Monjteur Barrillon, and printed 
at Xholouk tJ^is very year. ^ 
IN the Defcriptlon of this Channel^ inCcrttd in Numb. of 
thefe traBsy there was fome mencion made of the great Mar 
of Water, for a continual fupply in cafe of want 
thereof. This Store-houfe is more fully defcribed in this Letter ; 
where 'tis related, That it is in a Valley a little above the 
town of Rewel^ zt St. Feriol; and that 'tis to be filled with the 
waters of the Rivo!et Judot^ and ihofe of Rain and Snow, that 
are wont to be very plentiful upon the Black-mountain, This 
Valley is very narrow at the beginning, large in the middle, and 
ftreightened at the foot by theapproaGh of two Rocky Hills, 
bounding it on both fides which, to make a Lake and to keep 
in the water,, are conjoyn'd by a Caufey of fuch a height and 
thicknefs , that it may be cali'd a third Hi!!.. This Caufey is 
di fathoms broad and is to be 25 fethoms high , and 500 fath- 
Tong, to gain the Hills on both fides. The bajis of this great work 
is a folid Body of Mafbnry, laid, and every way enclofcd with- 
in the rock.. It hath only a fmall Opening below in the form of 
a Vault, which iseven with the ground , to ferve for a pafl^ige to 
the water of this Maga2in : This paflage is 9 feet large , 1 2 feet 
high, and 94 fathoms long. Upon this Body of Mafonry, which 
by fome fathoms exceeds the height of the faid Vault or Aque- 
duft, there is raifed a thick Wail from the top of this Dam,, 
down in a ftreight line to the foot of it. This Wall inclofeth 
within its^ thicknefs another Vault , in the manner of a Gallery;, 
the entry whereof, being at the foot of the Caufey, is of the fame 
heigrh and breadth with the forcner. This Gallery anfwers di- 
refily, from the top of the Caufey, to the Orifice of the Aque- 
duft, 5 fathoms above the furface of the ground,, and it runs, 
down along the fide, and on the left hand/of the Mouth thereof. 
Oil 
