AT the forthcoming meeting of the British Association in Leicester, the evening lectures will be by Mr. W. Duddell, on “The Arc and the Spark in Radio-telegraphy,” and by Dr. F. A. Dixey, on “Recent Developments in the Theory of Mimicry.” The lecture to the operative classes will be given by Prof. H. A. Miers, F.R.S., on “The Growth of a Crystal.”

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    Notes . Nature 75, 347–350 (1907) doi:10.1038/075347a0

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