The Mineralogical Society of America held its fourth annual meeting at Washington, D. C. on December 28 and 29, 1923, in conjunction with the Geological Society of America. Joint sessions with the Geological Society were held in the Interior Building on Friday afternoon, December 28, presided over by President Edgar T. Wherry, and on Saturday morning, December 29, presided over by Dr. David White, President of the Geological Society. At these sessions papers of combined mineralogical and geological interest were presented. The final paper of the session was the presidential address of Dr. Edgar T. Wherry entitled “At the Surface of a Crystal,” which is printed in full in this number.

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