Note 1 — Chapter I

Take, for instance, the Celtic word dúno-n, Latinised dunum, which is the Irish dún "castle" or "fortress," so common in Irish topography, as in Dunmore, Dunsink, Shandun, &c. There are over a dozen instances of this word in France, nearly as many in Great Britain, more than half a dozen in Spain, eight or nine in Germany, three in Austria, a couple in the Balkan States, three more in Switzerland, one at least (Lug-dun, now Leyden) in the Low Countries, one in Portugal, one in Piedmont, one in South Russia.

Celtic was once spoken from Ireland to the Black Sea, although the population who can now speak Celtic dialects is not more than three or four millions. As for Celtic archæological remains "on les trouve tant dans nos musées nationaux (en particulier au Musée de Saint Germain) que dans les collections publiques de la Hongrie, de l'Autriche, de la Hesse, de la Bohême, du Würtemburg, du pays de Bade, de la Suisse, de l'Italie." (Bertrand and Reinach, p. 3).