colloids, and (3) cement. This volume brings the subject matter up-to

with, however, most details of this matter intentionally left to the student. Those who have need of a laboratory manual of physical chemistry should ...
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colloids, and (3) cement. This volume brings the subject matter up-to-date and gives a good picture of the state of the science at this time. However, the work is more factual than critical. There are some errors in the book and authors’ names are sometimes misspelled. The complete three-volume set on inorganic colloid chemistry constitutes an important addition to the English works in the field of colloids. Investigators in the many phases of the subject will find Professor Weiser’s contribution both useful and valuable. L. H. REYERSON.

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257 pp. Physicochemical Ezperimenls. BY ROBERTLIVINQSTON.70 figures; xi New York: The Macmillan Company, 1939. Price: $2.25. The avowed primary object of this attractive appearing laboratory manual is to set forth a course illustrating basic principles. In addition, the experiments and procedures have been so chosen as to give the student familiarity with the more common and important apparatus and techniques. In the conduct of the experiments and treatment of results, a quantitative point of view is fairly uniformly maintained. The practice of having apparatus set up in advance for the student is regarded by the author as justifiable when the apparatus is complicated, but he feels that ‘(its general use seems ideally adapted to discourage any initiative or sense of responsibility which the student may possess.” Accordingly the apparatus and procedures are described and illustrated in sufficient detail so that the student should be able to set up and carry through the experiments himself without much assistance. The details are, however, not of such a character as to rob the work of interest. A useful feature of the book is the inclusion of general directions for performing a number of laboratory manipulations which have utility apart from that in the experiment under discussion. These include such things as the method of setting a Beckmann thermometer, the preparation and use of a thermocouple (incidentally more ice is needed on the cold junction, Fig. 48), use of the tablet press, use of the polarimeter, and the like. Frequent references are given to other books for further details. Another useful feature is the inclusion, occupying the first fifty pages, of a good, simple discussion of computing methods and the theory of errors of measurement. These matters should be studied a t some time by every science student. Forty-one experiments arc described, a number of which are new, a t least to the reviewer. Under each experiment is given a brief statement of the more pertinent theory involved, with definite references to well-known texts for more complete treatment. Then follows a list of apparatus and materials, and an apparently adequate section on procedure. Finally the treatment of results is briefly indicated with, however, most details of this matter intentionally left to the student. Those who have need of a laboratory manual of physical chemistry should certainly give consideration to this book. ROSCOE G . DICKINSON.

The Fine Structure of Matter. Volume I I , Part II: Molecular Polarization. By C. H. DOUQLAS CLARK, D.Sc., A.R.C.S., A.I.C., D. I.C. ;Assistant Lecturer in Inorganic Chemistry in the University of Leeds. 14.5 x 22.5 cm. ; lxxii 241 pp. ; 35 figures. New York: John Wiley and Sons, Inc., 1938. Price: $4.50. This second of the three parts which constitute Volume I1 of A Comprehensive Treatise on Atomic and Molecular Structure treats primarily refraction, dielectric constant, and dipole moment and their relation to molecular structure and, in so

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