The resemblance between the remains found in the Scottish and Irish lake-dwellings, as well as in many other antiquarian finds of Celtic character, must also not be overlooked. Combs, similar in structure and ornamentation to those from Buston, have been found in several of the Irish crannogs (Fig. 255);[48] in the Brochs and other antiquities of the north of Scotland, as at the Knowe of Saverough, Orkney (Fig. 256); the Broch of Burrian (Figs. 257 and 258); and in many of the ruins of the Romano-British towns, as at York and Uriconium (Fig. 259).[49] Iron knives and shears, variegated beads of impure glass, with grooves and spiral marks, ornaments of jet and bronze, implements of stone, bone, and horn, besides querns, whetstones, etc., are all common to Celtic antiquities wherever found. [Illustration: Fig. 259.--Bone Comb from Uriconium (2/3).] Canoes are so invariably found associated with crannogs, that their discovery in lakes and bogs has been considered by Dr. Stuart as an indication of the existence of the latter. This may be true in some cases, but in others, such as Closeburn, Lochwinnoch, and Loch Doon, three of the examples cited by him, it is more probable that the canoes were used by the occupiers of the mediæval castles in the vicinity of which they were found. From these and many other instances that have come under my notice, I have come to the conclusion that dug-out canoes do not indicate such great antiquity as is commonly attributed to them, nor do they therefore necessarily carry us back to prehistoric times. While some fragments of the pottery collected on the Ayrshire crannogs (all of which include Samian ware) are undoubtedly Romano-British, others as certainly point to a different period and source. I am informed on the best authority that all the portions showing any appearance of glaze, such as those represented by Figs. 181 to 184, were manufactured in mediæval times; but on the other hand that others (Fig. 186) may belong to the same class of fictile ware as was used for mortuary purposes in Pagan times. My own knowledge of the subject is too slender to guide me in forming an opinion on these points; but, considering how little is actually known of the pottery of the transitional period between that of the sepulchral urns and mediæval times, any conflicting inferences that may be deduced from such a line of discussion need not, at least in the meantime, interfere with the chronological conclusions pointed at elsewhere. The statement made by Grose (see page 155), that the monks of the monastery at Friars' Carse used to lodge their valuable effects on the artificial island in the loch when the English made inroads into Strathnith, suggests a possible, and perhaps probable, escape from any difficulty of this sort.