IN continuation of preliminary work published by Mr. H. Hyman and myself (Trans. Chem. Soc., 1914, cv., 1402) I gave an account in NATURE, February 4, 1915, p. 615, of the preparation of 80 grams of lead from Ceylon thorite and of the determination of its odensity in comparison with that of ordinary lead, which proved the thorite lead to be 0.26 per cent, denser. Taking the new international figure, 207.20, for the atomic weight of common lead, that for the thorite lead would be 207.74 on the assumption that the atomic volume of isotopic elements is constant.
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Il Nuovo Cimento (1921)