I think, therefore, that we fairly may hold the _Anglicus numerus_, or long hundred, to have specially prevailed in the 'Danish' districts, which were also assessed, we shall find, in sums of six and twelve. But what was the boundary of this Danish district? It was not the border between Mercia and Wessex, for Mercia was itself divided between the 'six' and the 'five' systems.[136] Of the two adjacent Mercian shires, for instance, of Leicester and Warwick (afterwards united under one sheriff), we find the latter decimal and the former duodecimal. The military service of Warwick and Leicester was arranged on the same method, yet Leicester sent _twelve_ 'burgesses' to the fyrd where Warwick sent _ten_. But, it may be urged, the two shires were divided by the Watling Street, the boundary (under the peace of Wedmore) of Danelaw. Was then the Danelaw the district within which the systems prevailed? No, for the Danelaw, under this treaty, included all Cambridgeshire and other hidated districts. The answer, therefore, which I propound is this: The district in which men measured by carucates, and counted by twelves and sixes, was not the district which the Danes _conquered_, but the district which the Danes _settled_, the district of 'the Five Boroughs'. Dependent on these 'Five Boroughs' were the four shires of Leicester, Derby, Nottingham, and Lincoln. For two of the Boroughs, Lincoln and Stamford, both belonged to this last shire, which was, indeed, the stronghold of the system.[137] Between Stamford and Cambridge we have the same contrast as between Warwick and Leicester, for while Cambridge was divided into _ten_ wards ('custodiæ'), Stamford was divided into _six_. Lincolnshire, as I have said, was the stronghold of the system, and it is in Lincoln itself that we find Domesday alluding _eo nomine_ to the _Anglicus numerus_, the practice of counting 120 as 100. Now in the peculiar district of which I am treating there occurs an important formula which covers Lincolnshire, Yorkshire, Derbyshire, and Notts. Domesday has nothing like it for the other parts of England. Here are the three passages in which we find it recorded: LINCOLNSHIRE YORKSHIRE DERBY AND NOTTS