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The compound HgBi2S4 was found to be the only phase present, other than the end members, in mixtures of HgS and Bi2S3. The compound is apparently a new structure type with monoclinic symmetry, space group C2, Cm or C2/m a =14.179, b =4.0555, c =13.986 A , β=118°13.8′ .

With the discussion of the history and prehistory of the law of Dulong and Petit, and of its application to the determination of the atomic weights [1], it was concluded that Dulong and Petit and their precursors were quite convinced that there was a stringent connection between the specific heats of the elements and their atomic weights. We want now to ask ourselves how far these relations have contributed to the discovery of the periodic system of elements.