The Origin of Tektites

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WITH reference to Dr. L. J. Spencer's letter in NATURE of October 7, p. 571, on the origin of tektites, the strongest argument against his suggestion that they were formed by the fusion of terrestrial material in meteorite craters is that no tektite has yet been described, so far as I am aware, containing partially fused rock or sand. A further possible objection that no tektite hitherto described contains so many vesicles as glass from meteorite craters is discounted by Prof. A. Lacroix's description of 95 kgm. of tektites from the island of Hainan and the neighbouring mainland, among which glass that originally enclosed vesicles of more than a decimetre in diameter is of frequent occurrence (``Les Tectites de l'Indo-chine'', Paris, 1932, appendix following p. 235). On the other hand, Dr. Spencer's suggestion finds support in the presence of metallic spheres, resembling those of the Wabar glass, in Darwin glass and in tektites from Indo-China, as described in his letter; and also in the presence of nickel in three Malayan tektites, proved by analyses by Mr. J. C. Shenton. As Dr. Spencer remarks, the evidence for tektites being meteoric is entirely negative; and although his suggestion cannot yet be accepted unreservedly, it appeals to me as the best yet proposed for the origin of these bodies.

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