Abstract
In the meeting room at the left of the platform by a round table was a merrury-vapor arc lamp, called a “Sun Lamp,”� provided and operated by Messrs. I. J. Alien and F. W. Robinson, representatives of the Hanovia Chemical and Mfg. Co. of Newark, N. J. Preceding the meeting the early arrivals surrounded the instrument and tried its effect on specimens of willemite, etc.. they had brought with them, including several cut gems. The greenish-yellow color of the gem variety of willemite was shown bv this light as by sunlight, and it vividly excited a residual glow in certain willemites and other sensitive substances.
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