MAY. 315 



32 and 33, by themselves, the one from the 

 carrier, the other from the ditch between it and 28. 

 13th, In regard to the respective operations to be 

 performed in each field, it is necessary in such a 

 work as this, merely to afford such general princi- 

 ples and hints as a man of any sagacity may apply 

 to every distinct piece of ground when he views 

 it. The grand principle which is to govern these 

 works is, to bring water on as plentifully as may be, 

 and let it run off quickly, nimbly, in irrigating 

 language : if it stagnates it does mischief, and if 

 it only creeps sluggishly, much less good than a 

 better course would have enabled it to effect. AH 

 spaces that arc level, or nearly level, should be 

 ploughed on to lands or ridges eleven yards wide, 

 and raised, if water be plentiful, three feet higher 

 on the crown than in the furrow, in this form, 



and, of course, these ridges must be laid out by 

 spirit level, so that the delivering trenches on their 

 crowns may be able to take water from the larger 

 carriers which lead along one head -land ; and that 

 the furrow-drains may convey the water away to 

 the receiving ditches provided for that purpose. 

 Those trenches are to be so exactly cut, that they 

 will overflow through the whole length equally at 

 the same time, for which purpose they lessen in 

 breadth as they advance. But upon dry slopes, no- 

 thing 



