[25] Congrès Préhistorique de Copenhague, p. 118.
[26] Putnam: “Report Peabody Museum,” vol. iii., p. 348.
[27] “Ancient Monuments of the Mississippi Valley.”
[28] See Dr. Hibbert in the Transactions of the Society of Antiquaries of Scotland, vol. iv., Appendix, p. 181.
[29] Zeitschrift für Ethnographie, 1870, p. 270.
[30] Pomerol: “Murailles Vitrifiées de Châteauneuf,” Ass. Franç., Blois, 1884.
[31] Congrès Soc. Sav., Sorbonne, 1882.
[32] J. Marion: Bul. des Soc. Savantes, 4th series, vol. iv. Daubrée: Rev. Arch., July, 1881.
[33] Sir J. Lubbock compares the ruins of Aztalan, in America, with the vitrified forts of Scotland; but we think this is a mistake, for the walls of Aztalan consisted of irregularly shaped masses of hard, reddish clay, full of hollows, retaining the impression of the straw or dried grass with which the clay was mixed before it was subjected to the action of heat, whether the application of that heat was intentional or accidental. There is nothing about this at all resembling the melted granite of the vitrified forts.
[34] De Cassac: “Notes sur les Forts Vitrifiés de la Creuse.” Thuot: “La Forteresse Vitrifiée du Pay de Gaudy,” p. 102.