In some cases their ethnical relations have not yet been completely determined.
The chains of Shar, Grammos and Pindus constitute a kind of natural boundary, which does not, however, coincide with ethnical limits nor with the Turkish administrative divisions.
The chief difficulty in deciding their ethnical relations is their remarkable physical difference from the neighbouring peoples.
7, where Cush is the "father" of certain tribal and ethnical designations, all of which point very clearly to Arabia, with the very doubtful exception of Seba, which Josephus (Ant.
The overwhelming numerical superiority of the Sla y s, and the very great differences in ethnical type, belief and mythology between the IndoEuropean and the Ural-Altaic races, may have contributed to the same end.