[ 275 ] 



Throughout this extenfive tra& of land, 

 I f. »und very deep fofTees cut, or old ditches 

 funk io deep as to give in every field the 

 command of a fufficient defcent. Thefe 

 are kept open. Into them run the covered 

 drains, which are cut in number propor- 

 tioned to the wetnefs of the land, but in 

 general at but a fmall diftance from each 

 other. 



Of thefe there are three forts, the lead- 

 ing or main ones of two kinds, and the 

 branches or fecondary ones. The firft 

 fort of main drains are two feet wide at 

 top and bottom, and four or five feet deep, 

 walled on each fide and covered at top 

 with large broad ftones. Plate II. fig. 44 

 The expence 6d. a yard running meafure* 



The fecond are a yard deep, two feet 



wide at top, and 10 inches at bottom ; the 

 ftones ufed in filling them are oblong 

 fquares of 8, 9, or 10 inches length, the 

 edges of which are refted on the fides of 

 the bottom of the drains, and fall on each 

 other at their tops, in the manner repre- 

 fented, Plate II. fig. 5. a. a. a. a. the drain 

 h. the tops of the iiones joining ; then 

 they are filled up with bits of ftone, within 

 feven or eight inches of the top ; and, 

 laltly, the molds thrown over all. 



The branches are three quarters of a 



yard deep, 18 inches wide at top, and 



T 3 nine 



