The superficial soil was gradually removed in order to expose the original flooring and examine its peculiar arrangement. During the removal of this stratum the workmen turned up a few antique specimens, amongst them portion of a glazed crucible, and a large mass of brownish metallic dross, quite convex on one surface. The principal stretchers--about forty in number--which composed the flooring were of black oak, in a tolerable state of preservation; each plank was from six to twelve feet in length, and from six to twelve inches square. They were laid down so as to extend lengthways from the circumference towards the centre, forming a number of radiæ somewhat like the spokes of a wheel; their outer ends were kept in position by slender crooked trunks of oak-trees forming a kind of circle, these again being fixed into their places by the outer row of stockades. The planks were not in close apposition, and the spaces so left were filled with thick branches of sallow, deal, and hazel, with the bark on; many of the branches extended underneath the sleepers, thus separating them from the peat bottom. The branches were for the most part rotten, and easily broken down. Hazel nuts were found here hard and brown, as if but just fallen from the tree. When the peat was removed to a depth of two feet near the outer part of the enclosure, the space so left was immediately filled up with bog water. A similar examination made near the centre exposed a hard foundation of blue clay. The timbers composing the crannog appeared to have been roughly hewn, and were not joined together by nails or mortises; two of the stretchers, however, had mortises. This site was most thoroughly examined. In the same marsh, but nearer to the ruin of Tonymore Castle, there were traces of two other stockaded dwellings (plate XLVII., fig. 202), an elevated causeway leading from them to what had been formerly the mainland.[219] _Cornagall._--_Ante_, p. 67. [Illustration: Plate XLVIII. Fig. 206.--General Plan of Drumkeery Lake. A--Island with Crannog. Scale 6 inches to one mile. Fig. 207.--Plan of Promontory with Crannog. Scale, 1 inch to 60 feet.]