(1) X-rays and Crystal Structure (2) The Structure of Crystals (3) Chemische Kristallographie der Flüssigkeiten: Kurze Anleitung zur Synthese und Untersuchung polymorpher und kristallin-flüssiger Substanzen

Abstract

IT is only about twelve years ago since the study of the crystalline state was the most neglected of all the branches of physical chemistry, so much so that a student who was full of learning about ions and about osmotic pressure would probably be unable to define a centre of symmetry or to describe the meaning of hemihedrism, unless he happened incidentally to have been also a student of mineralogy. The marvellous changes which have taken place in recent years have been due almost exclusively to the new methods of ostudying crystals by means of X-rays, which were odiscovered by Laue in 1912, and developed without delay by the Braggs. Some fifty-seven papers on the subject were already published in the year 1913, and it was only the diversion of scientific energy to other ends during the War period that kept the output for several years below thirty papers per annum. Since then, as Dr. Wyckoff's bibliography shows, the output has increased to such an extent that on the average two new papers on the subject are now being issued every week.

(1) X-rays and Crystal Structure.

By Sir W. H. Bragg Prof. W. L. Bragg. Fourth edition, revised and enlarged. Pp. xi + 322 + 8 plates. (London: G. Bell and Sons, Ltd., 1924.) 21s. net.

(2) The Structure of Crystals.

By Ralph W. G. Wyckoff. (American Chemical Society Monograph Series.) Pp. 462. (New York: The Chemical Catalog Co., Inc., 1924.) 6 dollars.

(3) Chemische Kristallographie der Flüssigkeiten: Kurze Anleitung zur Synthese und Untersuchung polymorpher und kristallin-flüssiger Substanzen.

Von Prof. Dr. D. Vörlander. Pp. 90 + 30 Tafeln. (Leipzig: Akademische Verlagsgesellschaft m.b.H., 1924.) 12 marks.