German critics have expended much labor and research, in defining the locality of the several German tribes with which the remainder of the Treatise is occupied. In so doing, they rely not only on historical data, but also on the traces of ancient names still attached to cities, forests, mountains, and other localities (cf. note, § 16). These we shall sometimes advert to in the notes. But on the whole, these speculations of German antiquarians are not only less interesting to scholars in other countries, but are so unsatisfactory and contradictory among themselves, that, for the most part, we shall pass them over with very little attention. There is manifestly an intrinsic difficulty in defining the ever changing limits of uncivilized and unsettled tribes. Hence the irreconcilable contradictions between _ancient authorities_, as well as modern critiques, on this subject. Tacitus, and the Roman writers generally, betray their want of definite knowledge of Germany by the frequency with which they specify the names of mountains and rivers. The following geographical outline is from Ukert, and must suffice for the _geography_ of the remainder of the Treatise: "In the corner between the Rhine and the Danube, are the Decumates Agri, perhaps as far as the Mayne, 29. Northward on the Rhine dwell the Mattiaci, whose neighbors on the east are the Chatti, 30. On the same river farther north are the Usipii and the Tencteri; then the Frisii, 32-34. Eastward of the Tencteri dwell the Chamavi and the Angrivarii (earlier the Bructeri), and east or southeast of them the Dulgibini and Chasuarii, 34. and other small tribes. Eastward of the Frisii Germany juts out far towards the north, 35. On the coast of the bay thus formed, dwell the Chauci, east of the Frisii and the above mentioned tribes; on the south, they reach to the Chatti. East of the Chauci and the Chatti are the Cherusci, 36. whose neighbors are the Fosi. The Cherusci perhaps, according to Tacitus, do not reach to the ocean; and in the angle of the above bay, he places the Cimbri, 37. Thus Tacitus represents the western half of Germany. The eastern is of greater dimensions. There are the Suevi, 38. He calls the country Suevia, 41. and enumerates many tribes, which belong there. Eastward of the Cherusci he places the Semnones and Langobardi; north of them are the Reudigni, Aviones, Anglii, Varini, Eudoses, Suardones and Nuithones; and all these he may have regarded as lying in the interior, and as the most unknown tribes, 41. He then mentions the tribes that dwell on the Danube, eastward from the Decumates Agri: the Hermunduri, in whose country the Elbe has its source; the Narisci, Marcomanni and Quadi, 41-42. The Marcomanni hold the country which the Boii formerly possessed; and northward of them and the Quadi, chiefly on the mountains which run through Suevia, are the Marsigni, Gothini, Osi and Burii, 43. Farther north are the Lygii, consisting of many tribes, among which the most