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During the course of some studies on possible mineral transport processes via the vapour phase, the deposition of lead chloride exhibiting various degrees of blackening was observed. This phenomenon occurs at relatively low temperatures (300400") when an atmosphere of hydrogen sulphide is present, and at somewhat higher temperatures in the absence of such an atmosphere. The blackening proved to be due to the presence of appreciable amounts of excess lead in the lead chloride. No sulphur could be detected. Earlier observations by Corbett and von Winbushl on this phenomenon refer to the equilibration of lead chloride and molten lead but the product does not appear to have reached the relatively high concentration of excess lead observed in the present experiments. Corbett and von Winbush also carried out transport experiments in which heated lead chloride was sublimed slowly over lead heated to 500-575" in an evacuated system; the condensed lead chloride did not differ from normal. Pyrosol studies on the system leadjlead chloride reported by Farquhason and Heymannz indicated that lead particles of colloidal dimensions could become dispersed in molten lead chloride and that this system solidifies to a grey mass. The black crystals obtained in the present work do not appear to represent a pyrosol as described by Lorenz,3 although the precise form of the incorporation of the lead has not yet been determined.

The growth of metal excess lead chloride from the vapour phase