Mineralogical Society, June 7, 1934, Sir Thomas J. Holland, President, in the chair. Prof. C. Palache: The form relations of the lead oxychlorides, laurionite, paralaurionite, and fiedlerite. The separate identity of each of the first two minerals is confirmed and their homoeomorphism is exhibited by a re-orientation of laurionite. The form series of fiedlerite has been simplified by the choice of a new unit form. New forms are described on paralaurionite and fiedlerite. The crystallography of all three species is summarized in new angle tables, and their habits are illustrated by a series of drawings.

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