NEW BOOKS chemical properties of nitrogen (a very full account of the spectra being included), and with active nitrogen. The account of the technical production of nitrogen includes patent literature. There is a good discussion of the atomic weight of nitrogen in which analyses of a large number of researches are set out in a very clear and instructive form. This first section of the volumes on nitrogen is very complete and of high standard, and covers a very extensive field of literature.J. R. Partington.Free Radicals. A general discussion held by the Faraday Society. 25 x 15.5 cm.;2 + 248 pp. London: Gurney and Jackson, 1934. Price: bound, limp cloth, 12/6.Once more the Faraday Society has placed physical chemists under a debt of gratitude. The reports of the discussions which they organize at frequent intervals are now well-known and highly appreciated, alike by those who are, and those who would be, up-to-date in their knowledge of the latest developments. By bringing together distinguished workers in a special field, hearing and answering questions, they not merely present the subject but present it alive.This volume is most timely and will be most welcome. It indicates how much
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