(7) 
command of the water, and you may turn it which way you 
pleafe, fo as to fill or keep dry any of the ponds, and in a wet 
feafon are a perfect fecurity. Thefe fhould be made four feet 
wide, and on each fide of the ponds the lofs of ground is not 
confiderable ; for wood growing there will make amends for 
it. 
The ftring of ponds in Hyde-Park are admirably difpofed 
in this refpeat; for the current of the valley is carried along by 
the fide of all the ponds, and may be let into any of them, 
or any may be emptied into it; than which, there is not a 
greater command of water. 
However carefully a bank is made, it is probable it will 
few a little at firft; but this fhould be no difcouragement ; for 
by the fettling of the earth, it will continually srow higher, 
and in a few years, if made with tolerable care, be as firm as a 
rock. 
Of Sluices. 
"PHESE are very requifite tothe good command of a wa~ 
ter, and though very ordinarily ufed, yet require an experienced 
carpenter to make and fix them as fhould be, efpecially in great 
waters; and fuch as have not experience, fhall err moft grofsly 
in this work, They muft be framed foas to ftand firm, that 
the 
