3QO WARPING. [JUNE. 



exceeding any other that has been heard of. It is 

 practised only in Lincoln and Yorkshire. 



The water of the tides that come, up the Trent, 

 Ouze, Dun, and other rivers which empty them- 

 selves into the great estuary of the Plumber, is 

 muddy to an excess ; insomuch that in summer, if 

 a cylindrical glass, 12 or 15 inches long, be filled 

 with it, it will presently deposit an inch, and some- 

 times more, of what is called warp. Where it 

 comes from is a dispute : the Humber, at its 

 mouth, is clear water; and no floods in the coun- 

 tries washed by the warp rivers bring it, but, on 

 the contrary, do much mischief by spoiling the 

 warp. In the very driest seasons and longest 

 droughts, it is best and most plentiful. The im- 

 provement is perfectly simple, and consists in no- 

 thing more than letting in the tide at. high -water 

 to deposit the warp, and permitting it to run off 

 qgain as the tide falls : this is the aim and effect. 

 But to render it efficacious, the water must be at 

 command, to keep it out and let it in at pleasure ; 

 so that there must not only be a cut or canal made 

 to join the river, but a sluice at the mouth to open 

 or shut, as wanted ; and that the water may be of 

 3 proper depth on the laud to be warped, and ;Jso 

 prevented flowing over contiguous hinds, whether 

 cultivated or not, banks are raif-od around the fields 

 to be warped, from three 1 or four to six or sevm 

 feet hij/h, according to circumstances. Thus, if 

 the tract be large, the canal which takes the water, 

 and which, as in irrigation, might be called the 



grand 



