191 



as well as in other Plates, not as absolutely 

 necessary in either plan, but as giving a 

 facility in the execution of each. The 

 place of the notches is not certain or fixed, 

 but variable at pleasure. In many in- 

 stances there is considerable fall in the 

 upper part of a meadow, and only a very 

 small descent in its lower part : in these 

 circumstances, catch-work may be adopted 

 on the higher part, and the ridge and fur- 

 row-plan on the lower, with the floating- 

 gutters branching at right angles from 

 the lowest distributing-ditch of the catchr 

 jvorL . 



B B 2 DIREC- 



