CENTURIATION IN ESSEX. 219 In this connection the widely centuriated area occurring on the eastern London Clay appears to be significant. It should be recalled that this area was apparently heavily settled during the La Tene III times. The Romans, however, do not appear to have greatly extended the clearings on the main mass of Boulder Clay—and it may be reasonably suggested, from a consideration of the few centuriation vestiges in the area, that it was only surveyed for clearing. A comparison is suggested by the way many Romano-British town walls were laid out on spacious lines, during the second century, to accommodate expected future expansion. Just as this expansion never materialised, so it seems that the clearing of the Boulder Clay was never accomplished, the few lengthy centuriation roads re- maining as witnesses of the conquerors' intentions. With regard to the London Clay area, in which the heaviest centuriation occurred, it is apparent that the Romans must have rapidly oc- cupied this district noticed as widely settled during the La Tene III times. We have already observed that settlement was easily carried out in this region of light woodland covering. Thus the Roman settlement in Essex appears to support Collingwood's dictum concerning the Roman failure to clear any new type of soil. It seems as if the invaders rapidly extended the areas of cultivation in those tracts where the British had made some progress. Particularly was this so in the eastern London Clay region. This district, with its light woodland cover, allowed a rapid clearing and preparation for tillage. It seems significant that the great area of Romano-British cultivation should have obtained here, and suggests, what is indeed true, that the Romans did not intend the improvement of the country for any philanthropic motives, but a rapid exploitation of its corn resources for the Empire's granaries. The Romans, acting the part of landlords, pushed forest clearing as rapidly as possible in those districts where it was easily accomplished. No great amount of capital was expended in clearing fertile, but heavily wooded, soils like the Boulder Clay, although such an action was within their power. The Romans did not and could not improve the agricultural methods of the British. We may, therefore, consider the Roman period as a time of consolidation during which existing clearings and partial clearings