erals. The structures are amply illustrated by figures so drawn as to assist the reader in building models of the various minerals for himself. The first three chapters contain a summary of crystal lattices. point-groups, and spare-groups. (sixteen pager); a review (twelve pages) of the methods of crystal analysis; and nine pages on ionic sizes, co6rdination numbers, Pauling's principle, and variate atom equipoints. These thirty-seven introductory pages serve t o give all readers a common starting point by outlining for them, from tbe standpoint of the author, subject matter which they are assumed t o know already. The b w k is written in that particularly clear style which bas already become associated with the name of Bragg. I t will prove of real value as a reference book on structural and chemical mineralogy. The late date of publication has enabled Professor Bragg t o include all important work in the literature up t o the end of 1936. The book should be in the library of every crystallographer, mineralogist, ceramist, and crystal analyst. WHEELER P. D A ~ Y
ORGANIC CHEMISTRY LABORATORY GUIDE. E. Werlhcim, Ph.D., Professor of Organic Chemistry in the University of Arkansas. P. Blakiston's Sonand Co., Inc., Philadelphia, 1937. 524 pp. 21.5 X 28 cm. $2.00. xxii
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ORGANICCXEMISTRYLABORATORY G-E "presents experimental material for a year's course in elementary organic chemistry," and is "especially designed for those students who are majoring in chemistry and those following the engineering or premedical curriculum." In addition to the more or less standard preparations, a few experiments are included that are not given in the usual manual and some of the preparations approach the semimicro procedures. Adequate test-tube experiments and identification reactions are included. Each experiment has a time schedule which should serve t o stimulate the student t o improve his laboratory dexterity. Mechanically, the manual presents a very good appearance. Only standard apparatus is required, and detailed instructions are given for carrying out the procedures. "All of the experiments have been tried by the author and a great effort made to avoid errors." Removable report sheets for all of the experiments, two hundred eighteen pages, are included as a part of the GUIDE.A space is provided in each report for the LABORATORY instructor's approval before the student proceeds with the assignment. The questions on the report sheets aim t o "test the student's knowledge of what he has done and show him the relationship of the compounds he has worked with t o others." The fist eleven experiments are devoted to important technic exercises, forty experiments deal exclusively with test-tube exercises ( a number of the preparations include some test-tube eaercises), and six experiments aim t o familiarize the student with the basic concepts of the identification of organic compounds. One hundred forty-five experiments are included. Preparations are given for methane, ethane, ethylene, acetylene, ethyl bromide, methyl iodide, iodoform, tertiary butyl chloride, ethylene bromide, ethyldimetbylcarbinol, diethyl ether, chloral, acetone, glacial acetic acid, formic acid, acetyl chloride, acetic anhydride, ethyl acetate, amyl nitrite, orthoformic ethyl ester, a sodium soap, acetsmide, trichloroacetic acid, oxalic acid, succinic anhydride, methyl hydrogen succinnate, acetonitrile, methyl amine, benzene, p-xylene, ethylbenzene, diphenylmethane, hromobenzene, p-dibromobenzene, nitrobenzene, bydrazobenzene, m-dinitrabenzene, p-nitrochlorobenzene. aniline, Pbromodimethylaniline, tetrabromodiphenylamine, Ciado-2-toluidine, m-nitromiline, p-nitroacetanilide, p-nitroaniline, diazoaminobenzene, aminoazobenzene, iodobenzene, chlorobenzene, o-cblorobenzoic acid, benzyl alcohol, triphenyl carhind, phenol, b- and o-nitronhenol. nicric acid. nhenetole. Nerolin.. .8-naubthvl . . acetate, o-phenctyl urea, p-phenetyl urea, benzaic acid, p-nitrobenzoic acid, hcnzamide, benzonitrile, methyl benzoate, aspirin,
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o-phenoxybenzoic acid, benzoin, benzil, benzilic acid, benzalaniline, salicylic aldehyde, 9-hydroxybenzaldehyde, acetophenone, anthraquinone, anthrone, phthalimide, anthranilic acid. phenylglycine-o-carboxylic acid, indigo, methyl orange, helianthin, Orange 11, Martius yellow, and xanthone. Alternate procedures are given for acetone, aniline, iodobenzene, p- and onitrophenol, benzaic acid, benzamide, and anthraquinone. Some test-tube preparations are included. The reviewer has only two criticisms of the manual: namely, the fill-in type of report, and the suggestive type of question t o be found in some of the exercises. The student should, in ihc opinion of the reviewer, be taught t o write an adequate report, and t o use his senses in such a way that he will be able t o feel, t o see, or t o smell the indications of the reaction without being forewarned. ED. F. DEGEUING PoRDCIE UNnrBPSlIY
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MOTIONPICTURBSOF THE WORLD, The Educational Film Directory. International Educational Pictures, Inc., 40 Mount Vernon Street, Boston, Massachusetts. 66 pp. 27.5 X 21.5 cm. Subscription price $2.00, each additional year or subscription $1.00. (Four issues annually.) "The first issue of the new MOTIONPICTURESoa ms WORLD will be published toward the end of September. This will be devoted t o arts and sciences. The second issue, t o be published about the end of November, will he arranged by countries. The third and fourth issues, t o be published each spring, will be completely revised editions of the first two issues. There will be no su~nlements." .. For the convenience of subscribers pending issuancr of the new quarterly the current issue of the clearing-house directory will he supplied free of charge. This notice superseder any which have appeared earlier.
BEARING METALSAND ALLOYS. H. N. Bassett, Chief Chemist. Egyptian State Railways. Edward Arnold and Company, 428 pp. 30 figs. 123 tables. 15 X 22 London. 1937. xiv cm. $8.50.
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I n the foreword of this book Sir Henry Fowler points out that of the so-called minor points of engineering none is of more importance than the bearing. I n spite of the growth of roller and ball bearings, there are still many applications of plain bearings. This b w k is the outmowth of a card index k e ~bv t the author for many years covering the whole field of bearing metals. It has as its purpose the summarizing of as much information as possible on this subject for the works engineer and for the designer of machinery. Enough of the modern theory of alloys is included t o point the way to research, but the hook is definitely written for practical use. It does not arbitrarily state which bearing metals must be used in individual cases, hut gives information upon which the engineer can work. The metals include the "whitemetals." copper alloys, zinc, lead, and phosphor bronzes and miscellaneous hearing metals. Some space is devoted to t h e subject of lubrication. There are abundant references t o books and journals. The tables outnumber figures, but the latter are very clear and are mainly photomicrographs. While this book is written primarily for experienced mechanical enPineers and metallureists..~ it has a d a c e in the libraries of enginrering schools. For the chemist in the small plant who has to do some engineering work and for the chemical engineer who often has to qualify as a mechanical engineer, this book is very valuable as a reference text.
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