While this book adds nothing new t o the subject, and will be of only passing interest to the specialist, it succeeds admirably in achieving the purpose for which i t was intended, the presentation of a simple, lucid, account of progress in the steroid field. It would be desirable t o have more books of this character dealing with progress in fields such as those of slkalaids, porphyrins, and so forth. RUSSELLE. MARKER
J. H. k&'enden. Oxford ~ n i v e & t y Press, New York City. 1938. xx 227 pp. 14 X 22 cm. $2.75.
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This book is an attempt to bridge the gap between the laboratory experience of the average student in elementary physical chemistry and the theoretically interesting problems of modern advanced physical chemistry with which he may have but a textbook acquaintance. The work consists of one hundred and thirty-three problems in the following groups: fundamental constants, stoichiometry, gaseous equilibria, heterogeneous equilibria, thermochemistry and miscellaneous thermodynamics, conductivity of solutions and transport numbers, equilibria in solution, miscellaneous electrochemistry, kinetics of thermal reactions, photochemistry, molecular structure, crystal structure, radioactivity. The problems have been chosen from Enelisb and American chemical journals of the la\t fifteen years With each prohlcrn there is given the neces*ary data for the snlution, refcrence tu the original literature, refrrencr tu standard tcxtbooks where !he subjpct is treated, notes on the solution of the problem. The answers, often in detail, are given in the back of the book. A table of useful constants, factors, and their logarithms is included. The problems chosen are strictly of an advanced nature, as is indicated by the titles of .the problems in one of the shorter groups, miscellaneous electrochemistry; the beat of solvation of ions; standard electrode potentials in methanol; an experimental test of the interionic attraction theory applied to heats of dilution; the kinetics of the electrolytic discharge of hydrogen and oxygen from aqueous solution; the electrolytic separation of deuterium; and the deuterium content of ordinary water and the electrolytic separation of the oxygen isotopes. The author has chosen important and typical problems, the solution of which cannot help but provide excellent training for students (and teachers) of advanced physical chemistry. This carefully prepared compilation should be of interest to every conscientious teacher of advanced students who desires to make sure that the experimental basis and method of calculation for many theoretical topics is understood.
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solutions being discussed: potassium permanganate, potassium diehromate, ammonium molybdate, potassium ferrocyauide, and sodium thiosulfate. There is no discussion of the purity of the primary standards used for these standardizations and no precautions are suggested, the apparent assumption being that they are "pure." This is a dangerous assumption, as every analyst knows. The analylical methods drseribed are acc
