It was remarked by the Czech linguist Pavle Ivi that it would be possible for particular linguistic landscapes to fit easily into particular theories about linguistic diffusion. He was referring especially to the difference between the Stammbaum or family tree theory and the Wellentheorie or wave theory as expounded by the Neo-grammarians. The family tree theory sees dialect features as genetically transmitted and traceable to the homeland of the group concerned. The wave theory on the other and concentrates more on the present geographical location of the speakers and traces the geographical diffusion of dialect features across the landscape independently of the movement of groups of people. If a distinction between family tree landscapes and wave theory landscapes is possible, as Ivi suggests, then the dialectology of the bedouin tribes of north-eastern Arabia falls quite definitely into the first group. In a previous article the writer described the dialect of the Muṭair tribe of Eastern Arabia which a dialect of the Central Najd type akin to the dialects of Central Najd and the 'Aniza tribes of the Syrian Desert. The Ḍhafr, although direct neighbours of the Muṭair to the north and west, speak a dialect of a quite different kind, basically North Najd, akin to the speech of the Jabel Shammar and the Shammar tribes, but with some admixture of Central Najd features. It seems that in this area dialect is a marker of tribal identity and since there is no gradation between membership of the Ḍhafr tribe and membership of the Muṭair, the dialects are similarly clearly demarcated geographically. The boundary between the Ḍhafr and the Muṭair also Muṭair also constitutes a more far-reaching boundary between Ahl al-Shiml and Ahl al-Jinb, northern and southern bedouin. This division is marked by dialect features and also certain other cultural externals such as dress and tent structure.
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