Chap. XII. Appendix, Part 6. No. 2. 141

0, three or four stops would be wanted in the feeder, to forcethe water out on the high ground : 2Jly, These stops would re-quire to be altered and realtered every time the water was re-moved from the high to the low ground, and vice versa: Sdly,A hatch would be required at O to keep the ground dry below,which would be as expensive as the one at the mouth of F 2.All of which circumstances put together, would render it as ex-pensive as the way described on the plate, and would be veryintricate and troublesome to manage ; whereas, in the presentway, it is quite simple and easy.

As this is supposed to be wet, spritty land, of the third class,a deep drain is made at d, for keeping off the sink of the mill-lead; and the beds are in general about eleven yards wide, andwell drained between.

Plate VI.

Fig. 1 . is supposed to be a bog (like class 4th mentioned inthe Chapter) lying between the foot of a hill and a streamof water, and abounding with springs issuing from the braeof the hill, which are all drained off by means of the drainsin the meadow, except the upper ones, which are conductedinto the second feeder, which forms a drain from thence to O,where it becomes the feeder for the second division when the wa-ter is on that part of the meadow, it being considerably lowerthan the upper part, by which means it gets the addition of thesesprings: At other times, the runnings of these springs are let outat 0, and pass down a drain cut for taking off the sink of thehill, &c. and are conveyed by the drain D into the stream. Theadvantages of two separate feeders are the same as in Plate V,which I need not here repeat.

The water for floating this bog is taken out at the junction oftwo small streams A A, and is forced into the conductor andfeeder, marked C F, by a dam or wear in the stream at B, theconductor being nearly level, or no more fall in it than is neces-sary to make the water move properly; by which means it watersthe piece below it as it goes along towards the uplifted hatch atH, where it enters F i, and is forced out by the obstructions ofthe stops (marked s) through the notches in the sides of thefeeder, and also into the floating gutters, and is spread over theland as represented in the figure. The other hatch in F 2, isshut down, which keeps the water up to a proper height; andwhen it is taken up, the other is put down. F 2 being lowerthan F i, drains the water low enough in C F, to prevent itsflowing out at the notches in the lower side, by which means thetwo divisions in the meadow may be alternately wet and dry;but, in a flood, both feeders may be open together.

The beds in this meadow are only 10 yards wide, with deepdrains betwixt them.