A treatise on chemistry. By the Right Han. Sir H. E. Roscoe, F. R. S., and C. Schorlemmer, F. R. S. Vol. I. The Non‐Metallic Flements. Fifth edition, completely revised by Dr. J. C. Cain. Pp. xv.+968. (London: Macmillan and Co., Ltd. 1920.) Price 30s. net
Journal of the Society of Chemical Industry, London