VOL.7, No. 5
RECENTBOOKS
Colloid Symposium Annual. Volume W. Edited by Dr. H. B. WBISER,Professor of Chemistry a t the Rice Institute. John Wiley & Sons, Inc.. New York, 1930. 23 X 15 cm. viii f 300 pp. 127 figures. $4.50. This book, formerly called the "Colloid Symposium Monograph," contains dl the papers presented a t the Seventh Symposium on Colloid Chemistry, held a t the Johns Hopkins University, June, 1929. Titles of the papers and authors are as follows: 1. "The Scattering of Light in Sols and Gels." P. G. DONNAN and K. KarrHwAxuarr.
2. "The Structure of Gelatin Sols and Gel.." S. E. Saep~ARoand J. G. MCNALLY. 3. "The Measurement of Hvdratition of Gelatin and Similar Materials and t h i Relation of Hydration to Swelling." HARvBX A. NBYlLLE and Enwrn R. Tnsrs. 4. "The hauence of Adsorption on the Grovth of Crystal Surfaces." K A R L P. HBnz-
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23. "Adsorption and the Permeability Membranes." H AB.WHISER. ~
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The established tradition of excellence and variety in the papen presented has been continued in this volume. One cannot read many of them without receiving inspiration for work in this important field. A detailed review of such a compilation is scarely practicable. Inclusion of the discussion on each paper might be an improvement. However, the reviewer wishes to congratulate the publishen and the editor on their successful effort. Every colloid chemist will want to add this volume of the annual to his set. MALCOLM M. HARING U N I M I ( S I01~ 1 MARYUND COLIBOBPA=,MD.
Diatomaceous Earth. ROBERTCALVERT, Chief Chemist, Van Scbaack Bros. WLD. 5. "Crystal Structure and Adsorption from Chemical Works, Chicago (formerly in so:. ut~on." '..s tgnrecance .WBSLBVG. of FBANCH. the Eleetro~apillary Charge of Research Labaratow, The curve.,; A. Pnurnrr. Celite Company, Lampac, California). 7. Determinatmn of the Number of Free Electric Charger on Air Bubbles and Oil Droplets American Chemical Society Monograph Dispersed in Water Containing a Small Amount Series No. 52. The Chemical Catalog of Cetyl Sulfonie Acid." JAMBS W. MCBAIN and ROBERTC. W I L L ~ ~ S . Cbmpany, Iuc., New York City, 1930. 8. "The Electrostatics of Plotation." H. B. xiii z;il pp. 70 figs. 15 X 23 cm. BULL. 9. "Some Evidence on the Nature of ExtraMolecular Forces." DONALDH. ANDRBW. 10. "The Adsorption of Vapors;' WALTBE A. P A m C K . 11. "The Specific Surface, Area of Activated Carbon and Silica." F. E. BARTBLL and Ylwo
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$5.00. This authoritative work on diatomaceous earth will be welcomed by all who have to do with this interesting and relatively abundant natural resource. Owners of diatomite deposits will be able to make some comparisons of their own material with that from other sources and to learn something of its uses and of the market conditions affecting its commercial exploitation. They will also discover that the successful development of their deposits and the marketing of the resulting products are dependent on the degree to which they are able to control these operations by thorough-going scientific research. Representatives of the various industries that involve filtration, heat insulation, concrete manufacture, and a wide variety of other activities will here find summarized with appropriate tables and graphs the results of much original experimental work dealing
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JOURNAL OF CHEMICAL EDUCATION
with the adaptation of different grades maceous earth than would have been and types of diatomaceous products to the possible had he been a geologist. Posrequirements of their respective industries. sibly this is a case where coBperation The fint half of the work is concerned between representatives of the two sciences with the description of diatomaceous would have produced a more rounded earth, its production, its mode and places and mare satisfactory treatise than could of occurrence, its mining and preparation have been made by either chemist or for the market, and its physical properties. geologist. The book is attractivelv printed in The second half is devoted to the tech. . nology of the application of various compact form. It contains numerous types and grades of diatomaceous earth well-selected halftone illustrations and is to the industries above enumerated. provided with indexes both of authors The former connection of the author and of subjects. Many references are with the world's largest producer of mide to U. S. and foreign patents. diatomaceous earth lends point to his G. R. MANSRIELD discussion and indicates that his account may in considerable measure he considered as a record of the experience of this company in attempting to develop BULLETINS and market an exceptionally large and Galvanometers. Catalog No. 20. Leeds high-grade deposit. & Northrup Co., Philadelphia, Penna. A geological reader, such as the re1930. 40 pp. Diagrams. 20 X 26.5 viewer, would have liked to find a little cm. Free. more discussion of the geological setting This catalog contains descriptions of of the various deposits mentioned, and he misses especially the maps and sec- galvanometers which cover practically tions which would have elucidated that' the entire range of applications for which phase of the discussion much more satis- they may be used. factorily than has been practicable in the present volume. On the other hand, CO, Meters (Electrical). Bulletin No. 781. No. 5-Power Plant Series, the author, being a chemist, has been Leeds & Northrup Co., Philadelphia, able to set forth much more fully and Penna., 1929. 24 pp. Diagrams. 20 satisfactorily the technological conditions X 26.5 cm. Free. attending the commercial use of diato-
Most Food Poisonings Caused by Meat. Meat and meat products are responsible for most food poisoning outbreaks, members of the American Public Health Association were told recently a t their Minneapolis meeting, by Drs. Thomas G. Hull and Lloyd Arnold of the Illinois State Department of Health and the University of Illinois College of Medicine. When much meat is eaten, the bacteria normally found in the smaU intestine, where meat is chiefly digested, are disturbed, the doctors explained. The germ-killing action normally occurring in the small intestine is interfered with for six hours after a meat meal. Thus when genus are taken into the system with a meat meal, they have a good chance to develop and cause illness. Material containing a germ frequently implicated in food poisonings will produce irritations of stomach and intestines when it has been added to fresh meat, but no poisonous effectcan be seen when the same material is added to a bread and milk diet, the scientists declared.-Science Sem'c'cc
