171 



hay-crop, in the line in which the trench 

 was made, owing to the mud, which is 

 ever found abundantly deposited at tlie 

 bottom of each trench. 



I deem it wholly unnecessary to give 

 any directions for the construction of 

 water-hatclies or flood-hatches, either as 

 sometimes forming a part of the weai^, 

 or as requisite to be placed in the mouths 

 of the feeders, as in plate 2, F. 1, 2, S; 

 for the common carpenter, in every viL 

 lage in the kingdom, must have seen 

 them, and is capable of making them- 

 One caution, however, may not be amiss, 

 that care be taken that the frame and 

 foundation of them be deeply and firmly 

 bedded in puddled gravel, or well-rammed 

 clay, and both the sides and bottom of 

 them be cased with stone or boards ; for 

 if the water once finds a passage eitlier 

 under, or by the sides of these erections. 



