Whatever doubt remains is not as to the generally manorial character of the _hams_ and _tuns_ of the earliest Saxon records, or as to the serfdom of their tenants; as to this, it is submitted that the evidence is clear and conclusive. Whatever doubt remains is as to which of two possible courses leading to this result was taken by the Saxon conquerors of Britain. As regards the methods of their conquest, there happens to exist no satisfactory contemporary evidence. They may either have conquered and adopted the Roman villas, whether in private or imperial hands, with the slaves and 'coloni' or 'tributarii' upon them, calling them 'hams,' or they may have destroyed the Roman villas and their tenants, and have established in their place fresh 'hams' of their own, which in mediæval Latin records, whether in private or royal possession, were also afterwards called 'villas.' In some districts they may have followed the one course, in other districts the other course. Either of the two might as well as the other have produced manors and manorial serfdom. [p421] «Survivals from the Romano-German province prove continuity, and are inconsistent with extermination» But when the internal evidence of the Anglo-Saxon land system is examined, even this doubt as to which of the two methods was generally followed is in part removed. For it may at least be said with truth that the hundred years of historical darkness during which there is a simple absence of direct testimony, is at least bridged over by such planks of _in_direct economic evidence as the apparent connexion between the Roman 'jugation' and the Saxon 'hidage,' the resemblance between the Roman and Saxon allotment of a certain number of acres along with single or double yokes of oxen to the holdings, the prevalence of the rule of single succession, the apparent continuance of the Roman _tributum_ and _annonæ_, and even some of the _sordida munera_ in the Saxon _gafol_, _gafol-yrth_, _averagium_, and other manorial services; and, lastly, the fact that in Gaul and Upper Germany the actual continuity between the Roman _villa_ and the German _heim_ can be more or less clearly traced. «unless the invaders were themselves Romanised.» The force of this economic evidence, it is submitted, is at least enough to prove either that there was a sufficient amount of continuity between the Roman villa and the Saxon manor to preserve the general type, or that the German invaders who destroyed and re-introduced the manorial type of estate came from a district in which there had been such continuity, and where they themselves had lived long enough to permit the peculiar manorial instincts of the Romano-German province to become a kind of second nature to them.