AND PEN CES. 17

as a green food for his fheep during the winter feafon. But before he ventures to fow this plant, let him remember, that where it is once eftablithed, it will hardly fail to{pread through the adjoining fields, and can hardly ever afterwards be tho- rougaly rooted out. Where the foil is rich, white-thorn plants may be ufed in place of eglantine, and will thrive re- markably well.

I have often imagined, that this kind of fence might be greatly improved, both in beauty and ftrength, by planting a row of ivy plants beneath the firft courfe of feal in building the dike, which would in a fhort time climb up the fides of the dike, and cover the whole with a clofe and beautiful net-work of woody fibres, covered with leaves of the moft beautiful verdure, which would tend to preferve the dike from being eaten away by froft*,

and

* It is generally allowed, that all the phenomena produced by what we call froft, are entirely occafioned by a certain degree of cold; and that, of confequence, if we by any means exclude the cold, we effectually guard againft the effects of froft. If this is the cafe, we would naturally expeét that thofe things alone

Vor.d. C would