^{page 411 note 1} “Die kosmische Natur der Moldavite und verwandter Gläser”: Centralblatt f. Min. Geol. u. Palaeontologie, December 15, 1908, No. xxiv, pp. 737–42.

^{page 411 note 2} Verbeek, R. D. M., “Glaskogels van Billiton-Jaarboek v. h. Mijnwezen in Nederlandsch Oost-Indië”: Wetenschappelijk Gedeelte, 1897, pp. 235–72Google Scholar, pl. i.

^{page 411 note 3} Krause, P. G., “Obsidianbomben aus Niederländisch Indien-Jaarboek v. h. Mijnwezen in Nederlandsch Oost-Indië”: Wetenschappelijk Gedeelte, 1898, pp. 17–31Google Scholar, pl. i.

^{page 411 note 4} Simpson, E. S., Geol. Survey of Western Australia, Bull, No. 6, Notes from the Departmental Laboratory, 1902, pp. 79–85Google Scholar, pls. i, vi–viii.

^{page 412 note 1} Simpson, , op. cit., p. 81.Google Scholar

^{page 412 note 2} Op. cit., p. 739.

^{page 413 note 1} The Pahang obsidiauites, like obsidianites elsewhere, have been stated to be pieces of slag resulting from smelting operations. A comparison of the physical and chemical properties of obsidianites and slag from a furnace in operation shows how wide of the mark this view is. A more interesting theory emanated from a Malay Rajah, who told the writer that he had collected a number of these stones and believed each to contain a gem in the centre. A valuation was asked for, and the writer felt sorry that it should fall to his lot to destroy the Rajah's belief by cracking one open for his inspection.