C8pO 
a little Labour : And here he fliews the Method of draw- 
ing a Veflel up the Stream, where the winding of the 
Stream makes an acute Angle, fo that Veflels are ape to 
ftrike againft it, and gives the Figure of an Engine for 
that purpofe. Proceeding to the other Impediments 
from the Channel : As to the firft, He fliews the ways of 
narrowing it by Piles drove down and inter-wound with 
Branches of Trees, the middle fill'd up with Fafcines 3 and 
on thofe great Stones : Thefe Works are to be made al- 
moft even with the Surface of the Water, that extraor- 
dinary Floods may go over them, rather than bear too 
hard upon them. He gives feveral Dire&ions for this 
matter, with the fliape of the Piles, and the ways of 
driving them above and under Water, annexing the Fi- 
gures of them, and the Engines for that purpofe. The 
means of remedying the iecond Inconvenience, caufed 
by the inequality of the bottom, or by Cafcades, are 
firft by Bridges with Rolers, over which the Veffel, 
which ought to be flat bottom'd, is drawn. Secondly, 
by Sluces, efpecially for Water-falls : Of thefe he fliews 
the make and ufe. For the third Obftacle, caufed 
by Rocks, he fliews the Method of working dry in the 
bottom of the Water, Co to break and carry them away, 
Then he fliews feveral ways of preferving the Banks of 
Rivers, by building Wings or Cribs to break the force 
of the Water • by Piles drove along the Shore ; by ma- 
king a new Channel, &c. He fliews fbme ways of clean- 
ing and evening the bottc>ms of Rivers, and proceeds to 
treat of Floods and Inundations, .with their Caufes, Ef» 
feds and Remedies, He concludes his Treattfe with the I 
ways of cleanfingand opening Ports and Channels, giving 
the Schemes of feveral Engines to this end. 
At 
