F. 1.--It is to Severus, therefore, that we owe the final development of this magnificent rampart, the mere remains of which are impressive so far beyond all that description or drawing can tell. Only those who have stood upon the heights by Peel Crag and seen the long line of fortification crowning ridge after ridge in endless succession as far as the eye can reach, can realize the sense of the vastness and majesty of Roman Imperialism thus borne in upon the mind. And if this is so now that the Wall is a ruin scarcely four feet high, and, but for its greater breadth, indistinguishable from the ordinary local field-walls, what must it have been when its solid masonry rose to a height of over twenty feet; with its twenty-three strong fortresses[286] for the permanent quarters of the garrison, its great gate-towers[287] at every mile for the accommodation of the detachments on duty, and its series of watch-turrets which, at every three or four hundred yards, placed sentinels within sight and call of each other along the whole line from sea to sea? F. 2.--Of all this swarming life no trace now remains. So entirely did it cease to be that the very names of the stations have left no shadow of memories on their sites. Luguvallum at the one end, and Pons Aelii at the other, have revived into importance as Carlisle and Newcastle,[288] but of the rest few indeed remain save as solitary ruins on the bare Northumbrian fells tenanted only by the flock and the curlew. But this very solitude in which their names have perished has preserved to us the means of recovering them. Thanks to it there is no part of Britain so rich in Roman remains and Roman inscriptions. At no fewer than twelve of these "stations" such have been already found relating to troops whom we know from the 'Notitia' to have been quartered at given spots _per lineam valli_. A Dacian cohort (for example) has thus left its mark at Birdoswald, and an Asturian at Chesters, thereby stamping these sites as respectively the _Amboglanna_ and _Cilurnum_, whose Dacian and Asturian garrisons the 'Notitia' records. The old walls of Cilurnum, moreover, are still clothed with a pretty little Pyrenaean creeper, _Erinus Hispanicus_, which these Asturian exiles must have brought with them as a memorial of their far-off home. F. 3.--Many such small but vivid touches of the past meet those who visit the Wall. At "King Arthur's Well," for example, near Thirlwall, the tiny chives growing in the crevices of the rock are presumably descendants of those acclimatized there by Roman gastronomy. At Borcovicus ("House-steads") the wheel-ruts still score the pavement; at Cilurnum the hypocaust of the bath is still blackened with smoke, and at various points the decay of Roman prestige is testified to by the walling up of one half or the other in the wide double gates which originally facilitated the sorties of the garrisons.