82 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS colloidal state from an original and different approach than the usual. Many chapters are quite mathe- matical, though necessary for the treatment desired. Some subjects seem to be covered in a sketchy manner such as the chapters dealing with emulsion and rheology. A few classical writers, such as La. ngmuir and Debye, get scant mentmn. It is a peculiar and difficult task to edit manuscripts on different though related phases of a subject and to maintain a similarity of style and a smooth continuity. Editor K. ruyt has done well in this connec- tion. A few scattered errors were noticed, most of which were cov- ered by a pink slip entitled "Er- rata." One gets the impression that the work was written under difficult circumstances and perchance all the literature on the subject was not readily available for checking. Even so, this set of volumes will undoubtedly set a new standard for all work on the colloidal state.-- M. G. DENavarre. RADIOISOTOPES IN INDUSTRY, edited by John R. Bradford, 309 pages, 6 X 9 inches, illustrated and indexed. Reinhold Publishing Corp., New York 36, N.Y., 1953. Price :/ 8.00. Fourteen chapters, written by as many contributors, with little dupli- cation, is a tribute to the editor. For the contents are based on lec- tures given at an international con- ference in 1951 at the Case In- stitute of Technology. The material seems to be up to date as of the time of preparation of the lectures. More recent data like the use of iridium 192 might have been added in the galley proofs. Chapters on "Radiation Protec- tion" by Glasser, "Applications of Radioisotope Techniques" by Rosenblum, as well as the Editor's own contribution, strike this re- viewer as being unusually good. This reviewer would like to sug- gest to the Editor that in future edi- tions, a brief introductory chapter on the general subject of radioac- tivity and nuclear reactions would not be amiss. Neither would it hurt the text to have a glossary of terms, for while many of us are ac- quainted with nuclear reactions, a brief review simply polishes our knowledge. If you are toying with radioac- tivity and its uses in industry, you can't be better informed than by reading and using this book.-- M.G. deNavarre. ULTRAVIOLET RADIATION, by Lewis R. Koller. John Wiley & Sons, Inc., New York, and Chapman and Hall, Ltd.,London. 1953. This is an eminently useful book. It acquaints the interested chemist, physician, biologist or bacteriologist with the different forms of ultra- violet radiant energy. Thus the chapter on "Arcs" first discusses the characteristics of this source of radiation and then proceeds to a description of the several different types of mercury arc and mercury vapor lamps, including sunlamps and germicidal lamps. Charts of spectral energy distribution illus- trate the performance of all the numerous radiation sources dealt with, and. indicate their actual and potential fields of application. Of particular interest is the chap- ter on solar radiation, in its physi- cal, climatic and geographic aspects. Although in the preface to the book

BOOK REVIEWS 83 the author disclaims any pretense of comprehensivehess, one might have wished a more exhaustive treatment of the biological effects of ultra- violet radiation, and particularly of its dermal action in its several as- pects (pigmentati'on, histopathology, allergy, etc.). Because of his back- ground, the author's primary inter- est appears to be in the physical an4 technicological fields, hence the somewhat sketchy treatment of the biological effects involved. However, the particular value of the treatise depends precisely upon the wealth of information it pro- vides in regard to the construction and performance of the different artificial sources of ultraviolet radi- ation, and to this extent the book fills a real need.--E. G. Lehn & Fink Prod. Corp.