In addition to this, it is only by the preservation of the pre-established race that the change in manners and customs, and the rapid development of the Anglo-Saxons can be explained. These roving pirates lose their taste for maritime adventure; they build no more ships; their intestine quarrels are food sufficient for what is left of their warlike appetites. Whence comes it that the instincts of this impetuous race are to some degree moderated? Doubtless from the quantity and fertility of the land they had conquered, and from the facility they found on the spot for turning that land to account. These facilities consisted in the labour of others. The taste for agriculture did not belong to the race. Tacitus represents the Germans as cultivating only what was strictly necessary.[35] The Anglo-Saxons found in Britain wide tracts of country tilled by romanised husbandmen; after the time of the first ravages they recalled them to their toil, but assigned its fruits to themselves. Well, therefore, might the same word be used by the conquerors to designate the native Celt and the slave. They established themselves in the fields, and superintended their cultivation after their fashion; their encampments became boroughs: Nottingham, Buckingham, Glastonbury, which have to the present day retained the names of Germanic families or tribes. The towns of more ancient importance, on the contrary, have retained Celtic or Latin names: London, York, Lincoln, Winchester, Dover, Cirencester, Manchester, &c.[36] The Anglo-Saxons did not destroy them, since they are still extant, and only mingled in a feeble proportion with their population, having, like all Germans, a horror of sojourning in cities. "They avoided them, regarding them as tombs," they thought that to live in towns was like burying oneself alive.[37] The preservation in England of several branches of Roman industry is one proof more of the continuance of city life in the island; had the British artisans not survived the invasion, there would never have been found in the tombs of the conquerors those glass cups of elaborate ornamentation, hardly distinguishable from the products of the Roman glass-works, and which the clumsy hands of the Saxon were certainly incapable of fusing and adorning.[38]