The economics of the sulfuric acid industry. By T. J. Kreps. Pp. xiii + 284. California: Standford University Press; London: H. Milford, Oxford University Press, 1938. $5; 23s

The organic chemistry of nitrogen. By N.

The organic chemistry of nitrogen. By N. V. Sidgwick, F.R.S. New edition. Revised and rewritten by T. W. J. Taylor, M.A., and W. Baker, M.a., D.Sc. Pp. xix + 590. London: H. Milford, Oxford University Press, 1937. 25s

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CaRPO,. The filtrate is worked up for calcium nitrate. Among thc othcr prodi1ct.s of this works arc phosphoric acid and nminoniuin phosphntc nnd ccrtnin ngriculturnl preparations under trade names and contdiling known irmounts of phosphorus and nitrogen.