and value. The theoretical aspects of surface action are well covered and a representative list of surfactants is included. An encyclopaedic volume of this sort cannot be expected to provide a great deal of detail; but on the many occasions that we have used this book since its arrival we have never been disappointed. That speaks for itself. Pulmonary Deposition and Retention of Inhaled Aerosols. By T. F. Hatch and P. Gross. Academic Press, New York, 1964. pp. xiv+192. $3,45. Today, more than ever before, there is a need for the specialized monograph rather than the broad general text-book. Here is an outstanding example of the way in which such need can be met, in the first of a series of monographs prepared under the direction of the American Industrial Hygiene Association for the Division of Technical Information, United States Atomic Energy Commission. In one slim, handy volume we have an up-todate account of the basic facts of inhalation exposure, starting from the anatomy and physiology of respiratory deposition of aerosols and the physical factors involved, progressing through experimental approaches to the measurement of deposition of inhaled aerosols to chapters on the clearance of material from various sectors of the respiratory tree. Finally there are chapters on aerosol hazards and the measurement of respirable aerosol exposure. What a joy to read a book on these complex topics and find that each aspect is described with crisp, sparkling clarity. This is true whether the authors are dealing with the translation from animals to man of dose-response toxicity data for inhaled particulate substances, or whether they are gently leading the reader through the maze of problems on the measurement of aerosol composition and concentration. Let us hope that the appearance of further members of the series will not be long delayed --and that the high standard will be maintained.
The Stabilization of Polyvinyl Chloride. By F. Chevassus and R. de Broutelles. Edward Arnold (Publishers) Ltd., London, 1963. pp. xi+385. 80s. On p. 851 of this issue we discuss some studies on the nature of the chemical bond between several stabilizers and polyvinyl chloride (PVC). It is timely, therefore, to make brief mention of this English translation of a French text which spans all aspects of PVC stabilization. The authors discuss the mechanism of PVC degradation in some detail, as a preliminary to establishing possible ways of counteracting it. Another chapter in this section considers photodegradation with particular reference to ultraviolet light screening agents. Part 2 deals with the main types of stabilizer, their properties, structures and representative commercial products; and with the stabilizer mixtures which are commonly used in industry. The third part is a detailed discussion of the practical aspects of PVC stabilization. Consideration is given here to the influence of the other components of a formulation and to specific problems arising in the manufacture of different types of product, such as electrical insulating compounds, flexible calendered products, rigid vinyls and vinyl-based coatings. Each chapter is liberally supplied with references, including many patents, and the text ends with a list of European and American producers, giving trade names and chemical identification of their products. References to the toxicity of these compounds, or their acceptability for use with foodstuffs, are few and brief but in other respects this would seem to be a valuable review of a complex subject.