[ 9^ol 
flfdt^iiA^ it fomttiin^^s bi^p^ the fiats are as low 
ai tKe fT6ighl^ti% im probability axe&lledi 
atid then itis^iiot only neceflGsry to make the pafflage 
fii-om the flat to the r!val€t> but likewile to fink the ri- 
vulet which is very troublelome j commonly thc paffage 
to be cut is Rocky : having never fcen any of them cnt^ 
I can only fay thus much 5 
1, Before they begin, a furveyor ought to take the level 
of the flat with the place into which the vent'is to be 
made, and if the plac^ be lower the vent is p6fEblc> *^ 
2, A good xomputat ion ougbt to be made, what the 
.vent will coftr" how much land it will drain ? what the 
'^^^nd is worth per zctc.as it is? and what it will yield whea 
draind? and by that he will fee, whether it be worth thfe 
while to attempt it. 
\:^ \ 3 j The holes iViVought to be opened, and, digged.and 
fenced about, that grafs^ and ether dirt, may not get 
into them > forty this means the water will in its or- 
dinary courfc, get fooner away ; and laftly they are to 
be eaten very bare towards the end of Summer, that as 
H$^Ic gr^|s as is goffible msLj. be f|)oil| b^ the tet* , 
5 'H-^ -iiixjons^^id 
Jib- . 
