In some respects the most interesting broch site in Orkney is that at Lingrow, about two miles S.S.E. of Kirkwall. Contiguous to this building lies a perfect labyrinth of building of secondary occupation. A coin of Vespasian and two of Antoninus were found at Lingrow when the site was excavated in 1870. Another interesting specimen is that at Hoxa in South Ronaldshay. The little that remains of this building is situated on the west side of a small bight which opens northwards on Scapa Flow, and on the east side of the bight stands the site of a second broch. The two brochs together command both the bight itself and a narrow isthmus of land which connects it with Widewall Bay to the southward. Defence of the land passage between the two areas of water was obviously a prime motive of construction in this case. Other interesting specimens of brochs are at Okstro in Birsay, at Burgar in Evie, and at Burrian in North Ronaldshay; but many of the Orkney sites remain as yet unexcavated, or only tentatively explored. Stone hand-mills (querns), stone whorls and bone combs, both used in woollen weaving, stone lamps, imitated from Roman models, hair combs, and fragments of pottery are some of the articles found in the Orkney brochs, none of which now show more than a few feet of their original height. A consideration of the geographical position of the main area of their distribution leaves one with little doubt that they were erected as the best and most economical means that a scanty and scattered population could devise to check continuous piratical incursions, probably directed from Scandinavia and the coastal regions of north-western Europe; but the exact era of their erection is a question that still awaits definite solution. One may safely conjecture, however, that they were gradually destroyed by the incursions which they were built to withstand.