JOURNAL OF CHEMICAL EDUCATION
814 satisfactory and complete theory must be capable of explaining all the established and uncontested facts. . .based on a scrutiny of the mass of experimental results that have been reported in the published literature over the last twenty-five years." In one of the latest theories advanced to explain sintering, the process effects a louering of the free energy of the system by nucleation, reorystdlimtion, and grain growth as progressive stages, and the respective rates are related to the nature of the surface of the particles. Accordingly, particle shape and particle size distribution have specific effectson the diffusion phenomena. Except for interferences caused by evolution of gases, the sintering is analogous to fusion. But it can occur at temperatures far below the normal melting point of the lowest-melting phase. In addition to the expected surveys of the properties of refractory metals, cemented carbides, electrical materials, magnetic materials, friction products, dental alloys, and so on, considerable attention is given to an honest comparison of properties of powder metal products with those of the same materials manufactured in other ways. Reference is made as well to msterisls and praresnes that have not been adopted for either technical or economic causes. The treatise is very comprehensive, richly documented, and. so far as is humanlv nossible. unoreiudiced. I t udl remain a
accelerated pace.
tion and replacement reactions, addition reactions, and rearmngements. A bibliography concludes eeoh chapter. The book contains numerous illustrative eauations and oresent8 the background far the arganio researoh-program in bcrmanvdurine thenast two or three decades. TI& lithaprinting and binding are both very good and this book should prove to be a valnahle addition to the library of any organic chemist. E. F. DEGERING
THE AMERICAN FIAT REVIEW OF GERMAN SCIENCE (193%1946). VOLUME 35: THEORETICAL ORGANIC CHEMISTRY, Part I1 Walter Hzckel, University of G-Hingen. I. Goubeau, G. V. SchuIz, and G. Scheibe. Translated, edited, and published in cooperation with the Office of Technical Services, Department of Commerce, U. S. Government, by The 0. W. Leibiger Research Laboratories, Inc., Petersburg, N. Y. Lithoprinted by The M. H. Davidson Co., New Haven, Conn., 1951. d i f 221 pp. 43 figs. 21 tables. 13.5 X 22 cm.
"MILITARYGovernment of British, French, and U. S. Zones of Germany by means of their respective FIATS (Field Information Agency, Technical) present this volume of the 'Fiat Review of German Science' in the hope that it will assist in informing international science of research done in Germany through the war THE AMERICAN FlAT REVIEW OF GERMAN SCIENCE years. It is believed that this and its companion volumes u-ill THEORETICAL ORGANIC 11939 19461. VOLUME 34: present a complete and conoise account of the investigations and CHEMISTRY advances of s. fundamental scientifii nature made by German -" , chemistrv. mathematics. mediWalter Hickel, University of GEttingen, and F. Seel. Trans- saientists in the fields of bioloev. lated, edited, and published in cooperation with the Office of cine, physics, and soiences of the earth duridg the period df May, Teohnioal Services, Department of Commerce, U. S. Govern- 1939, to May, 1946. "For the information of the individual reader of this volume, ment, by The 0. W. Leibiger Research Laboratories, Inc., Peters the following statement must be made: The original from which burg, N. Y. Lithoprinted by The M. H. Davidsan Co., New Haven, 213 pp. 6 figs. 8 tables. 13.5 X 22 cm. this translation has been made, is the property of the People of Conn., 1951. x the United States of America, placed into their hands by the com$5.30. bined Militaw Governments of the British. Frenoh. and U. S. "ITIS unusud that a developm?nt report in a, soience comprises Zones of Germany by means of their respective FIAT^, written the achievements of a single country, in this case Germany. not only by one outstanding author hut by many, eeoh an expert However, the special circumstances of the present time make this in his field, and each going into such h e details in s manner, as necessary." for none of the research workers of Germany use the only top scientists are able to do." Part 11, s. continuation of Pmt I, opens with Chapter V, Assoterminology adopted in the Anglo-Saxon countries. "Although other German research workers are not historically ciation, Dipole Moment, and Surface Tension, which covers bound in a. similar manner, they were not able to disregard the survey over the treaties; validity range far the law of mass schistorical development in theoretical organic chemistry in Ger- tion; association, dipole moment, and orientation; association of many if they wished to avoid any discrepancy with other organic phenols; and heterocyclic compounds. Chapter VI, Constitution and Physical Properties, deals with chemists not gaged to theory. May whoever reads this report as topios such as dipole moments, surface tension, viscosity, other a nou-German, therefore, have an understanding for the individuality of the representation and for the ways selected for German empirical data, Kerr effect and optical anisotropy, crystalline fluids, and constitution and color. theoretical research in organic chemistry.'' Chapter VII deals with Absorption Spertra, Chapter VIII with Chapter I, General Structural Chemistry and Chemical Linkage, deals with definitions; energetics, thermodynamics, and Raman Spectra, and Chapter I X with Mechanism and Kinetic kinetics; proton mobility; tautomerism; mesamerism; bonding of Polymerization Reactions, including subtopics such as introstates; onium compounds, inner-oomplex compounds, and duction, test procedures, thermal polymerization of styrene and molecular linkages; and solid-solution formation and oriented the excitation of radicals, peroxides ss accelerators, explosive oolvmerizatian. inhibitors. stabilizers and reeulators. and initisintergrowth. Chapter I1 on Stereochemistry covers configuration, polymembered rings and bridge-ring systems, molecular structure and rate of reaction, configuration and basicity, stereoisomerism of the This is a good companion volume to Part I. double bond. stereoisomerism of inner-complex salts, and o~tical activity. E. F. DEGERING Chapter I11 desk with free carbon radicals and biradieals, and BUOIM*NL*BOR*TORIEB. INC. Chapter IV on Reaction Processes deals with schemes far substituM D M * ~ tea , ~ ,we as^^ BELMONT. M*BB*OHOBBTTS
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LAURENCE B FOSTER
