RECENT ANALYTICAL PROCESSES, A PHYSICO-CHEMICAL INTERPRETATION. The purpose of the index is to provide a convenient classificaT.B. Smith, Ph.D., A.R.C.S., BSc., Lecturer in Chemistry a t tion of the ring structures used in organic chemistry along with the University of Sheffield. Second Edition. Edward Arnold a standard and authoritative system for their numbering and and Co., London, 1940. (Distributed by Longmans, Green nomenclature. The entries in the index are classified first accordand Company, Inc., New York City.) viii 470 pp. 50 ing to the number of rings present in the structure and then figs. 14 X 22 cm. $5.00. accordin= to the numher of atoms in the ComDOnent rines. For each entry thcre arc givcn: ( I ) a strurturnl formula showThis book was written as a text for quantitative analysis, stressing the theoretical principles. A few working details are ing the standard mellmd of numberinl: rhc component atoms of included in this edition hut "the chief aim is still to supplement the rings; (2) a serial numhrr to .;ervr as a method of identifying the system in references to it; (3) the systematic name of the rather than supplant the ordinary type of practical textbook." This in itself makes it unusual. entry; (4) any generally accepted name which takes precedence. The author's approach to his subject is unique and has resulted over the systematic name (in hold-face type); (5) any other in a most interesting hwk. Separate chapters are allocated to trivial names which are more or less generally accepted (in italics); the precipitations of barium sulfate, lead sulfate, ferric hydroxide, (6) one or more original literature references, usually including the silver halides, the sulfides, and various separations of mix- the earliest work giving the structure with certainty; (7) a~ tures (though mainly calcium and magnesium). Likewise pre- volume and page reference to the fourth edition of Beilstein's.. sented are the titrations of the halides with silver nitrate (which "Handhuch"; (8) other methods of numbering, di5erent from includes a discussion of an adsorption indicator), cyanide with the standard method, but used to an appreciable extent in thesilver nitrate, and acid with a base. The theory of oxidatian- literature. If the name of a given ring system is known, it may easily be. reduction reactions has been presented in this edition in considerable detail. Less attention has been given to the theory of located by consulting the alphabetical index a t the end of the electr-alysis. Various theories and concepts. such as mass ac- book, or if the name is unknown, the system may he located bytion, ionic product, pH huffers, modern views concerning acids using the general classification which is completely described inr and bases, solubility product, common ion, and colloids are intro- the introductory pages. The authors and their collaborators are to he congratulated on duced in an early chapter; others are presented in the various discussions as needed. the usable form and the completeness with which THE RINGA rather considerable amount of mathematical physical INDEX fulfills its purpose, and it is to be hoped that organic chemistry is included, which, despite the best efforts, cannot he chemists will forego personal preferences and adopt the standard made really simple, unless the reader is well prepared. For this nomenclature and numbering therein set forth. reason the book is perhaps best adapted to advanced courses or M. F. ROY reference use. BROWNUNIYBRSTTY PROY~DBNCB, RHODB ISLAND REXJ. ROBINSON
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A LIST OP RINGSYSTEMS USEDIN ORGANIC THE RINGINDEX. C n e m s m . A. M. Patterson, Professor of Chemistry, Antiocb College, and L. T. Capell, Associate Editor of Chemical Abstracts. American Chemical Society Monograph No. 83. Reinhold Publishing Corp., New York City, 1940. 661 pp. 15 X 23 cm. $8.00. This work is a compilation of all of the ring systems, about 4000 in number, that have been reported in the literature of organic chemistry through 1939. Only parent ring structures are given, and not those of their derivative compounds. Included are the simple parent rings, parent systems of more than one ring in which the rings have one or more atoms in common, and in deference to current usage, a few ring systems containing ionic valences (e. g.. hetaine). Cyclic cotkdination complexes (chelate rings) and systems like biphenyl and diphenylmethaue, in which the rings are not joined by actual sharing of atoms, are omitted.
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How TO TEACHA J4s. R. D. Bundy, A.M., E.E., Industrial! CMrdinator, Board of Education. City of Cleveland, National Foremen's Institute, Inc., Deep River, Conn., 1941. 63 pp. 13.3 X 20.2 Em. $1.00. This W a l , mtended for foremen, supervisors, job setters, and vocational instructors, has as its purpose the outlining of the steps in t h n teaching process, and the pointing out of the definite^ procedmes mvolved. The author looks at the problem in view of tH? vm-rgency situation brought about through the National Defense Drogram, with the need for training men quickly and effici6Efly. Considering teaching as "putting across ideas." the autho$ follows the teaching process through the steps of preparation, demonstration and explanation, questions by the teacher,. illustration, application, and inspection of the work, ending with a lesson planning analysis. The manual is based on common sense, but it may focus attention upon paints often neglected in: industrial work.
