NEW BOOKS VoEumetm’c Analylsis. By H. P. STARCK. 228 pp. Baltimore: William Wood & Company, 1934. Price: bound, $3.00. This book is written primarily for pharmaceutical and medical students and seems t o be suitable for the purpose. However, i t cannot be recommended as a text for students in chemistry, since the theory is entirely inadequate, a great many of the procedures are repetitions and not up-to-date, and some of them are highly inaccurate. I. M. KOLTHOPF, Dipole Moments. A General Discussion held by the Faraday Society. 25 x 16 em.; lxxxvi 227 pp. London: Gurney and Jackson, 1934. Price: (in stiff cloth covers) 21s. This volume, reprinted from the Transactions of the Faraday Society, contains twenty-four papers and a general discussion on dipole moments and related topics, which were communicated at the Faraday Society’s Symposium a t Oxford in April, 1934. The papers, which include contributions from the leading workers in this field in America and Europe, are divided into three groups: Part I. Dielectric Constant; Part 11. Determination of Dipole Moments; Part 111. Interpretation of Dipole Moments. The first section begins, as is fitting, with a paper by Debye, on “Energy Absorption in Dielectrics with Polar Molecules.’’ The other two papers in this section deal with the temperature variation of the dielectric constant of some crystalline solids. The nine papers in the second section are mainly concerned with the dielectric behavior of concentrated solutions, dipole association, and cohesion, and with the difficulties encountered in the calculation of dipole moments from polarization measurements in solution, in particular, the vexed question of the atom polarization, and the effect of the non-polar solvent on the apparent dipole moment. These papers constitute a valuable summary of the present position in these matters. The third section contains papers which cover a very wide field of the application of dipole moment measurements to problems of molecular and stereochemical st r uc t ure . An appendix of some eighty-six pages contains an excellently arranged catalogue of dipole moment data compiled by Dr. N. V. Sidgwick and his collaborators. This is the most complete list of dipole moments which has been published, and would in itself render the volume invaluable as a book of reference. In this list are given, not only the actual dipole moments, the authors, and references, but also the temperature or temperature range of measurement, the solvent or medium in which the measurement was carried out, the method used for the elimination of P,, the allowance which has been made for Pa, and the observed value of mP2 where this is given by the author. The book is indispensable t o workers in the field of dipole moments and contains much of interest to the general reader.
+
F. FAIRBROTHER. 437
