Both north and south of the Alps the dependence of man on cereals after he gave up his milk and flesh diet seems to have made him desire salt, and the Early Iron Age settlements of Gaul are closely related to sources of salt, while the Mediterranean coast-lands had ample opportunities of salt getting. The pig had been domesticated by this time, and the salting of bacon and fish gave a reserve for the winter, but it has been claimed that salt was also in request for forms of porridge, &c. In thinking of the early {93} settlements we should remember that north of the Alps there was perpetual danger lurking in the dark forest, while in the south there were the rough goatherds of the mountains. In the last millennium before Christ the worsening of the Scandinavian climate drove peoples southwards towards Gaul, and thus led to a growth of hill-fortress towns, of which the supreme examples were Alesia, Gergovia, and Bibracte, and from Gaul the building of these fortress towns spread, with sea commerce, up the west coast of Britain, where Tre'r Ceiri on Yr Eifl in Carnarvonshire furnishes us with one of the best examples of this type of settlement of the Iron Age or Romano-British times. For the purposes of this sketch it is not necessary to go into great detail about the Roman efforts, but we should note that within the bounds of their Empire they spread wheat cultivation, road communications, and their legal system, and that along with this seems to have gone a cheapening of iron. All these changes helped to knit the people to the soil, to make neighbourhood take the place of kinship as a basis of association, to root a language in the people's hearts. It is the men who 'lacte et carne vivunt', as Caesar puts it, who organize on a kinship basis, move from place to place, and lack the written records which do so much for language fixation. We thus see in Gaul villages of various types in regions of differing history and opportunity, but pre-Roman fortress towns and Roman cities between them networking the country and related to roads built or adapted by the conquering engineers, and we note the implanting of linguistic features that not all the shocks of later disruptions have contrived to uproot. In Britain again are villages of varying types, pre-Roman or Romano-British fortress towns, chiefly on the west coast headlands, Roman cities for the most part speedily ruined, and Roman roads. The difference in the vitality of the cities is to be correlated with the difference as to language; the Roman elements in our language {94} are for the most part the result of reintroduction later on. The Roman element in Welsh is usually allowed to be important.