Montauban , are for the River Agoujl > thofe of Tholoufe , for 
J^iege 5 and the reft, for Lers. 
Now concerning his Opinion upon this Propofition , he 
thinks, that all that hath been reprefented touching this matter, 
can fignify very little,feeingthat the main thing iswanting, which 
is the afllirance, and certain and pofitive menfuration of the 
height and quantity of the Waters, neceftary to fall into both 
the Channels of the Aude and Garonne : that there mu ft be plen- 
ty of that, to furniih at all times and al waies the higheft and firft 
Sluces, lince what once iffuesa hence, doth never enter again 
into them s and after fome Boats arepafled, if there fhould not 
be a iufficient fupply for thofe that come after, either to go 
up, or to go down, all would ftand dry, and Merchants and their • 
Commodities would ftay long enough expecting the fupply of 
Rains, to their great detriment. He coucludeih therefore , , 
that no knowing and difereet Perfon is able, in matters of this ; 
nature, to give a pofitive anfwer, without having before him ai 
large and exaCt Topographical Map of thofe places, and of: 
the fources of all the Rivolets, that are to fupply the Water to* 
the Head of the pretended Channel, together with a full ac- 
count of the furvey and menfuration of all the places, through] 
which it is to pafs ; of the Nature of the Ground, whether it be; 
ftony, fandy, rocky, &c. of the exaCt level of all the places , 
where it is to be made, and of the feveral rifings and depreflions; 
thereof, to be aftured that the Water may be conveyed to thet 
greateft riling, and to the higheft Since s and laftly,of the quan- 
tity, that may be had at high, middle, and low Water, to have e- 
nough for all times ; that all thefe things being firft made out, 
'tis then time enough to judge of the poffibility of the thing, and: 
to calculate the Charges neceftary for Execution. 
This Artift having thus prudently waved this Propofition, di- 
verts himfelf with reflecting upon feveral others of the like na- 
ture, among which he infifts chiefly upon two, whereof one is: 
that fo much celebrated in Egypt , ; the other, of Germany. And 
he is ofOpinion, that the moft important of all is that, of con-i: 
joyning the Red fea by the Nile with the Mediterranean , which! 
he looks upon as the moft excellent con vemency to go into the-; 
Eaft-hulies without doubling the Cape of Good-Hope* and yet id 
could 
