<i>A Treatise on Chemistry</i> . By Sir H. E. Roscoe and C. Schorlemmer. Vol. I., The Non-metallic Elements. New edition completely revised by Sir H. E. Roscoe: assisted by Drs. H. G. Coleman and A. Harden. London, Macmillan &amp; Co., Ltd.; New York, The Macmillan Co. Pp. xii + 931.
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