(4^) , 
Montauban, are for the River ^goufii thofe of Thokufe , for 
'Riege-y and the reft^ for Lers, 
ISlow concerning his Opinion upon this Propofition , he 
thinks, that all that hath been reprefented touching thii matter, 
can lignify very httle,feeingthat the main thing iswanting, which 
is the affurance, and certain and pofitive mcnfuracion of the 
height and quantity ot the Waters, neceffary to fall into both 
the Ch .uinels of the Atide and Garonne : that there muft be plen- 
ty ot thac,to furnifli at all times and alwaies the higheft and firft 
S^luceSy fiince what once iffues die nee, doth never enter again 
niCo them ; and after fome Boats are paffed, if there fhould not 
beafufficienc fupply for thofe that come after^ either to go 
upsor to go down,ali would Itand dry,and Merchants and their 
Commodities would ftay long enough expediing the fupply of 
Rains, to their great detriment. He concludeih therefore , 
that no knowing and difcreet Perfon is able, in matters of this 
nature, to give a pofitive anfwer, without having before him a 
large and exad: Topographical Map of thofe places, and of 
the fources ofall the RivoIetSj that are to fupply the Water to 
the Head of the pretended Channel, together with a full ac- 
count of the furvey and raenfuration 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 exadt level of all the places , d 
where it is to be made,and of the feveral rifings and depreflions % 
thereof, to be afTurcd that the Water may be conveyed to the * 
grcateft rifing, and to the higheft Sluce > and laftly,of the quan- 
tity,that may be had at high^ middle, and low Water, to have e- 
nough for all times j that all thefe things being firft made out, ] 
"cis then time enough to judge of the poflSbility of the thing-,and j 
to calculate the Charges neceffary for Execution. 
This Artift having thtis prudently waved this Propofition, di- 
verts himfelf with refledltng upon feveral others of the like na- 
ture, among which he infifts chiefly upon two, whereof one is 
that fo much celebrated in Egjpt^ 5 the other, of Germany. And 
he is ofOpinion, that the moft important of all is that, of con- 
joyningtheKf^/i?<g^bythe7V/7^ with the Mediterranean^ which 
he looks upon as the moft excellent conveniency to go into the 
EaJldtidiesyf\i\io\\ido\xh\ingx\iQ Cape oi Good-Hope i and yet it 
could 
