1 the tage aft t0 ted, ened ig the is will ficult >, and

———ESE

Sean

to the Firft Volume. 607

every obftacle cleared away, that the water may run freely into a thallow fiream. If it is required to afcertain exactly, or to fix the future limits of the water, a fection of the greateft quantity running out during a flood fhould be taken. fection, for example, ten feet wide and four feet deep; by making it 40 feet wide, the fame quantity of water will not rife above one foot: confequently, by this means walone, three feet in height will be gained all round the lake, which, embanking it, would be a very great object*,” The fummer feafon is the beft time to carry on thefe as well as ments; but when materials are to be brought from a diftance, th

Suppofe this

in cale of

other embank- cy may be laid down or prepared at other feafons, excepting the turf, which fhould always be ufed as foon as poffible after it is cut. The manner of confiructing embankments of this nature is the fame as in other cafes. The methods employed in making embankments againft the{ea on the eftate of Lord Galloway are reprefented in Plate XX XVIII. at figs. 7, 8, and g. They were formed to the heights of three and a half and five feet, having the breadths of fix feet and five feet at the bafes, and 20 inches at the tops. They were conftructed almot wholly of turfs or fods, vith only a little well beaten tuff in the middle of one of them; and with two finall drains, one on each fide, about two feet in depth, coft about 3d per yard. In executing all forts of embankments, the greateft care fhould be taken to make them perfectly firm and water-tight, by conftantly beating and ramming them well while they are forming.

To be read after Line 22, Page 216.—It has been fuggefted that the oily particles with which the fleece of fheep is charged, exfuded without doubt from the animal, though an imperceptible, may probably be a powerful manure; when fheep lie down, this animal exfudation may be abforbed by the foil. It might be worth inveftigation, whether this fecretion be more copious in one breed of fheep than another; and whether it equally abounds in the fine thort fleece of the Norfolk breed as in the coarfer but more ample clothing of the Leicefter, South Down,&c. Lo the oilinefs of their fleeces may alfo perhaps be attributed the great injury which fheep commit on young trees, by rubbing themfelves againft the bark.

To be read after Line 32, Page 290—The ordinary method of forming thefe fuper- ficial drains is to excavate channels in the form of a wedge, that is to fay, with the

* Beatfon in Communications to the Board,&c. Vol. Il, VOL. I.* 4G