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The results of two independent structure determinations of diphenyl disulphide are compared by means of half-normal probability plots. No systematic errors are detected except in the temperature factors of the sulphur atoms.

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The crystal structure of thiosemicarbazide, previously determined from photographic data, has been redetermined using intensity data collected by means of a four-circle Picker diffractometer at room temperature. The analysis has been valuable in giving a direct determination of the hydrogen atom positions. The final R= 2.4%. Earlier hypotheses on the hydrogen bonding are confirmed.