When, in the ruins of a station, inscribed stones are found bearing the name of a cohort mentioned in the Notitia, the inference is natural, that, in most cases at least, the imperial Notitia will furnish us with a key to the ancient designation of the station. The argument becomes irresistible, when, in several successive instances the designations thus obtained correspond exactly with the order of the places as given in the Notitia. Let us take an example. At the station of Chesters, on the North Tyne, several slabs have been found, bearing the name of the second ala, or wing, of the Astures. One of these is here represented.[30] It is a sepulchral stone, and bears at the end of the third and the beginning of the fourth lines the words— · · · · · · ALAE II ASTVR[UM]· · · · [Sidenote: CILURNUM APPROPRIATED.] [Illustration] Now, as the Notitia represents this ala, or troop of cavalry, to have been stationed at Cilurnum, the probability is, that the camp on the west bank of the North Tyne is the CILURNUM of Roman Britain. Immediately following ‘The second wing of the Astures at CILURNUM,’ on the Notitia list, is, ‘The first cohort of the Batavians at PROCOLITIA.’ Now the station immediately west of Chesters is Carrawburgh, and here a slab and an altar have been found, inscribed with the name of this very cohort. The woodcut represents one of them,[31] an altar to Fortune, which is thus inscribed— FORTVNAE COH I BATAVOR[UM] CVI PRÆEST MELACCINIVS MARCELLUS PRÆ[FECTUS] To Fortune The first cohort of the Batavians Commanded by Melaccinius Marcellus, Prefect. [Illustration] The conclusion is natural,—Carrawburgh is the PROCOLITIA of the Notitia. [Sidenote: BORCOVICUS ASCERTAINED.] Moving westward, the next station we come to is Housesteads; here numerous inscribed stones have been discovered, which mention the first cohort of the Tungri. One of these, an altar to Jupiter, which is now in the possession of the Society of Antiquaries of Newcastle-upon-Tyne, and is preserved in their museum, is accurately given in the accompanying engraving. I[OVI] O[PTIMO] M[AXIMO] ET NVMINIBUS AVG[USTI] COH[ORS] I TV- NGRORVM MIL[LIARIA] CVI PRÆE- ST Q[UINTUS] VERIVS SVPERSTIS PRÆEFECTVS