The main population did not reside on these hills, since they are for miles naturally dry. But, from below their edge rise innumerable bright streams, by which, "no doubt, were the settled habitations, the Cyttian of the early Britons, followed by the Saxon _tun_ and the Danish _by_; on the hills above were long boundary fences, and within these the raths and tumuli, the monumental stones and idols. In situations where nature gave peculiar advantages, one of the grand manufactures of the tribes was established. The fabrication of pottery, from the Kimmeridge clay about Malton, was undoubtedly very extensive in British days, and characteristic both as to substance and fashion; that of bricks and tiles at York was equally considerable in Roman days, and it is curious to walk now into the large brick-yards and potteries which are successfully conducted at these same places, on the very sites which furnished the funeral urn, and the perforated tube which distributed air from the hypocaust." We may acquire some idea of Roman road-making from the following details:--"From the wall of Antoninus to Rome, and from thence to Jerusalem, that is, from the north-west to the south-east point of the empire, was measured a distance of 3,740 English miles; of this distance 85 miles only were sea-passages, the rest was the _road of polished silex_. Posts were established along these lines of high road, so that 100 miles a day might be with ease accomplished. A fact related by Pliny affords an example of the quickest travelling in a carriage in ancient times. Tiberius Nero, with three carriages, accomplished a journey of 200 miles in twenty-four hours, when he went to see his brother Drusus, who was sick in Germany." (_Burgess._) The towns, and forts, and roads are, however, very far from being the only traces of Roman occupation that remain in our country. Camps, occupying well-chosen positions, occur in numbers, which testify the difficulty with which the subjugation of the island was accomplished; while the remains of stately buildings, with ornamented baths, mosaic pavements, fresco paintings and statuary, and articles of personal ornament, which are discovered almost every time that the earth is uncovered to any considerable depth, prove the eventual wide diffusion of the elegant and luxurious mode of life which it was the aim of the conquerors to introduce. Roman glass and pottery, in great variety, and frequently of the most elegant shape, abound; but the most valuable are the sepulchral urns, which betoken the neighbourhood of towns, of which perhaps no other traces now remain.