In most cases the earth-works are so low and slight that they could not have been of much service unless crowned with palisades. They are usually on sites that are more susceptible of cultivation than the hill-tops which are the common positions of the stone-works, and hence they have suffered more generally from agricultural operations than the forts of stone. They are usually irregularly circular or oval in plan, consisting of a varying number of low embankments drawn round the summit of a natural eminence. The only one of which a scale-plan has been made is a very characteristic example (Fig. 250), on the Midhill Head, on the estate of Borthwick Hall, Midlothian.[98] The space enclosed by the embankments is 410 feet in length from east to west, and 284 feet in breadth from north to south. The embankments are four in number, occupying a space round the enclosure, varying from 130 feet to about 80 feet in breadth. They are nowhere more than from 4 to 5 feet in height. There are two entrances to the enclosed space at the ends of the oval, and a third on the south side. This example represents in a general way the class of earthworks of most frequent occurrence, consisting of a series of circumvallations enclosing the highest part of an eminence of no great elevation. ----- Footnote 98: _Proc. Soc. Antiq. Scot._, vol. xiv. p. 254. The Society is indebted to the liberality of the proprietor, D. J. Macfie, Esq., for the plan of this characteristic earth-work, surveyed and described by Mr. W. Galloway, architect. ----- [Illustration: Fig. 250.—Ground plan of Earthwork on Midhill Head, Midlothian.]