( 71 i 
The Tecond principal Caufe of choaking up the Ld- 
gftna, is the Sea Concerning which our Author ob- 
ferves, that the Tide of Flood iets into the Laguna from 
along the Coad of I(lria and Friuli, where it is per- 
petually walhing away the Land in great Quantities^ 
with which, and the Sand which it raifes upon high 
Winds in the Shallows near the Shore, it enters the 
Laguna excedingly turbid and foul ; efpecially, when 
the Wind blows hard at South- Ead, at which times 
the Tide of Flood is feveral Hours longer than the 
Ebb. This occafions very high Tides in the Laguna, 
and a great part of the Water, which enters by the Flood, 
not being carry ’d out by the fubfequent Ebb, has the 
more time to difeharge its Soil and Sand in the Laguna. 
This IS an Enemy very hard to deal with, however 
our Author propofes fome Works of flrong Piles, and 
large Stones thrown in between them, to be carried 
diredly forward into the Sea, in order to break th» 
Violence of the Waves, and prevent their ’wafhing and 
carrying away the Land. 
Fde feems likewife to favour a Propofal made by the 
late famous Guglidmini, and fome others, to let the Tide 
enter the Lai^una by more PafTages than it is to go out 
at, in order to make it run out with a greater Velocity, 
and thereby fcour and deepen the Channels. Bur he 
thinks this Contrivance will fcarcely perform all that 
is expeded from it; befides that, it will be attended 
with great Difficulties in making Works, and Flood- 
gates of a fufficienc Strength, to refifl: the Violence of 
the Waters. 
He occahonally combats the Opinion of Guglidmini, 
and moft other Mathematicians who have thought up- 
on the Subjedlf', that in order ro give a greater Velo- 
city to the Water of a River, thereby to fcour and 
cleanfe the Channel, it is proper to make the Outlet 
narrower. 
