Abstract
IN a recent letter to NATURE (April 20, p. 603), Hughes has suggested that the interesting spiral markings on carborundum reported by Menzies and Sloat (Mar. 9, p. 348) may be a special case of periodic crystallisation. Hughes refers to a remark in a paper by Miss Henley and myself (J. C. S., 2725; 1928) concerning the formation of spirals in Liesegang rings as anomalies caused by accidental external conditions.
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