If we ask what proportion these foreign and miscellaneous elements in the Roman Legions of Britain bore to the true Romans, we wait in vain for an answer. This is because the constitution of the other portions of the army is unknown. Who (for instance) composed the _Fortenses_, the _Stablesiani_, the _Abulci_, and numerous other companies? Perhaps, Romans; in which case the proportion of Syrian, Slavonian, and other non-Roman elements is diminished. Perhaps, Syrians, Slavonians, or Germans; in which case it is increased. That the above-named troops, however, belonged to the ethnological divisions which are denoted by the names, is in the highest degree probable. It is also probable that the list may be increased; thus the _Pacenses_, the _Asti_, the _Frixagori_, and the _Lergi_, although there are doubts, in every case, about the reading, and still greater about the signification, have reasonably been thought to have been regiments, or companies, named from the localities where they were levied; but, as already stated, these localities are doubtful. As blood foreign to both the British and Roman was introduced into Britain, so was British blood introduced elsewhere. All the foreign stations of the British troops are not known; but that there was, at least, one in each of the following countries is certain--Illyricum, Egypt, Northern Africa. The history of foreign blood in Britain, and of British blood in foreign countries are counterpart questions. The lines of Roman road are the best _data_ for ascertaining the parts of our island where the mixture of Roman and foreign blood was greatest: since it is a fair inference that those districts which were the least accessible were the most Keltic. These are North Wales, Cornwall and Devonshire, the Wealds of Sussex and Kent, Lincolnshire, and the district of Craven. On the other hand, the pre-eminently Roman tracts are-- 1. The valleys of the Tyne and Solway, or the line of the wall and rampart which divided South Britain from North. 2. The valley of the Ouse, or the parts about York. 3, 4. The valleys of the Thames and Severn. 5. Cheshire and South Lancashire. 6. Norfolk and Suffolk.