That the people thus occupying these peculiar strongholds were the people of the soil, and not strangers effecting a lodgement in a hostile territory, is obviously suggested both by the character and relations of the typical structure, and by the character and relations of the relics of their domestic life. It has been demonstrated in the previous Lecture that while the typical structure, taken in the totality of its characteristics, stands absolutely alone and quite apart from all other types of construction, ancient or modern, its essential features are those which are characteristic of early Celtic constructions. It is circular, it is dry-built, its doorways have inclined instead of perpendicular sides, the roofs of its chambers are formed of beehive vaulting of overlapping stones, and its galleries are comparable to a series of earth-houses placed one over the other. It has now been shown that the relics of the life of the occupants of the Brochs constitute a group of objects differing widely from those which characterise the Scandinavian occupancy of the north and west of Scotland. No group of objects in its general _facies_, entirely comparable to the group which is characteristic of the Brochs, exists on the continent of Europe or anywhere out of Scotland. But when the typical forms of the Broch group of relics are compared with those of other groups existing in Scotland, it becomes at once apparent that they are forms which are characteristic of the Celtic area and of post-Roman times. This unique series of objects from a unique type of structure illustrates a peculiar phase of the early Celtic or Iron Age culture and civilisation of our country which until recently was absolutely unknown. And as we find the investigation on which we have embarked continuously disclosing series after series of similarly unique types, it becomes increasingly apparent that its final result can be nothing less than the establishment of the fact that Scotland has an archæology—in other words, that the unwritten story of her early systems of culture and civilisation is dispersed among the _disjecta membra_ of her scattered remains, and is only to be disclosed by the systematic collection and study of all existing materials illustrative of her native industry and native art, with their associated indications of social organisation and potential culture.