come in from Ireland, much as other barbarians entered other parts of the Empire, but their dates and numbers are very little known; see my _Romanisation of Roman Britain_, pp. 27 foll. and refs. there given. The invasion of Caledonia (p. 183) by Agricola has been illustrated by recent discoveries. As I have pointed out elsewhere, we have traces of Agricola’s line of forts (Tac. _Agr._ 23) at Camelon (_Proc. Soc. Antiq. Scotland_, xxxv. fig. 10) and Bar Hill (G. Macdonald, _Roman Forts on the Bar Hill_, Glasgow, 1906). Farther north, near the junction of the Tay and Isla, at Inchtuthill, in the policies of Delvine, a large encampment of Roman type has yielded a few objects datable to the Agricolan age (_Proc. Soc. Antiq. Scot._ xxxvi. pp. 237, 242), and may give a clue to the site of Mons Graupius. Farther south, the large fort lately excavated by Mr. James Curle, at Newstead, near Melrose (_C. I. L._ vii. 1080, 1081; _Scottish Hist. Review_, 1908), was certainly occupied in the Agricolan age. To this date, too, may perhaps be assigned the siege works round the native fortress on Birrenswark in Dumfriesshire, with their leaden sling-bullets (_Proc. Soc. Antiq. Scot._ xxxiii. 198 foll.). Evidence that the Legio ii. Adiutrix was then posted at Chester, probably forming a double-legion fortress with Legio xx., was obtained in the excavations of 1890 (_Catal. of the Grosvenor Museum, Chester_ (1900), pp. 7 foll. and Nos. 23-35). An inscription from Camelon with the letters MILITES L·II·A·DIE may have been intended to refer to this legion, but is a forgery (_Class. Review_, xix. 57). No trace of Agricolan or of Flavian remains has yet been found on the line of Hadrian’s Wall, except at two points, which, strictly speaking, are near but not on the wall, Carlisle (Luguvallium), and Corbridge (Corstopitum), where the two great north roads pass on towards Caledonia. For the influence of continental frontier troubles on the British operations of Agricola see also Ritterling, _Jahreshefte des österr. arch. Instituts_, vii. 26. The years between the recall of Agricola and the building of Hadrian’s Wall (roughly A.D. 85-120) are a historical blank. Even the position of the northern frontier during these years is unknown. The Romans seem to have soon withdrawn from the line of the Clyde and Forth (Macdonald, _Bar Hill_, pp. 14, 15). Whether they also withdrew south of Cheviot is not quite clear, in the present state of the Newstead excavations.