undoubtedly succeeded, but it does not follow, as we have striven to show, that he has himself produced a good treatment of the subject. As a book on a chapter of applied mathematics we believe it weak; as a book on mathematical problems suggested by aeronautics, it is excellent."- Engineering, Aug. 5, 1921.

Also reviewed in Mechanical world, Aug. 12, 1921.

Broughton, H. H. The electrical handling of materials. A manual, in four volumes, on the design, construction and application of cranes, conveyors, hoists and elevators. Volume II, Structural work. London: Benn Brothers, Ltd., 1920. XV, 292 p. illus. 4°. 25 s. VFG (121)

When completed, the four volumes will constitute a thoroughly revised edition of the author's Electric cranes and hoists. Volume 1 has already been noted in New technical books, vol. 6, no. 1. Volume II deals with structural work and mechanical equipment, such as gearing, transmission devices, bearings, etc.

"It is evident that the author has set himself the task of dealing with the electrical handling of materials in a more comprehensive manner than has ever before been attempted; and it is also now apparent, as we would have expected from the excellence of the author's previous works, that he is succeeding in accomplishing his ambition... The type is clear and the illustrations are of fine quality, and it should be pointed out that most of the latter have never before been published... Almost the only work which deals really and effectively with the subject from a to z." The Electrician, June 17, 1921.

*Burton, E. F. The physical properties of colloidal solutions. New York and London: Longmans, Green & Co., 1921. viii, 221 p. 2. ed. illus. 8°. $4.25. PLD (118)

Second edition shows thorough revision and some enlargement. Has a good historical introduction. Describes the preparation and classification of solutions and treats fully of the ultramicroscope. There are chapters on the Brownian movement, optical properties of solutions, measurements, motion of particles in an electric field, stability, and practical applications. Chapter 8 on coagulation has been entirely rewritten in the light of recent investigations. Good bibliographies. Author is Associate Professor of Physics in the University of Toronto.

*Campbell, Norman Robert. Physics. The elements. Cambridge [Eng.]: University Press, 1920. vii, 565 p. 4°. £2.0.0. PAE (117)

A confessedly incomplete coordination of a series of essays begun in 1904. A critical analysis of the subject matter of science; the nature of laws; discovery, proof and explanation of laws; theories; chance and probability; the meaning of science; science and philosophy; and measurement. Author is a member of the staff of the research laboratories of the General Electric Company, Ltd., London.

"The book [of which this is the introductory volume] aspires to be a treatise on physics, complete within its limits, written by a serious student of the science for other serious students. It is not in any sense a popular work addressed to those whose chief intellectual interests lie elsewhere; it assumes throughout entire familiarity with all the facts and theories of physics, ancient and modern." Introduction.

Carter, H. R. Jute and its manufacture. New York: The Macmillan Company [1921]. 192 p. illus. 8°. $2.00. VLR (121)

"It is an extraordinary fact that only about ninety years ago the jute industry, which now ranks second in importance to cotton as a raw material of British manufacture, was practically non-existent." — Page 1.

Development of the industry is briefly traced; cultivation and qualities of the fibre discussed; and preparation and manufacture described in detail. 70 illustrations.

Chalmers, T. W. The gyroscopic compass, a non-mathematical treatment. London: Constable & Company, Ltd., 1920. x, 167 p. illus. 8°. 11 s. net. VXFD (Stack 3)

To explain the mode of action of this efficient instrument the author aims to employ the most familiar physical principles and conceptions. Discusses elementary gyroscopic phenomena, the gyroscope and the rotation of the earth, the various systems of damping, latitude and steaming errors, ballistic deflection, quadrantal errors, centrifugal forces, and descriptions of the Sperry, Anschütz and Brown types. The seventeen chapters appeared originally as a series of articles in The Engineer, London. Fifty-one illustrations.

"The author is to be congratulated on having produced a book which will appeal to all who are interested in gyroscopic action. Moreover, it will be of use to engineers and navigating officers who are responsible for the care of working instruments... The explanations of the fundamental dynamics are clear and sound.. We have no hesitation in recom. mending this book." - Nature, May 12, 1921.

Clark, W. Mansfield. The determination of hydrogen ions. An elementary treatise on the hydrogen electrode, indicator and supplementary methods with an indexed bibliography on applications. Baltimore: Williams & Wilkins Co., 1920. 317 p. illus. 8°. $5.00. PPR (118)

"There are many people who have to determine hydrogen ion concentrations for one reason or another, and it means a great saving to them if they can find all the details of such determinations brought together in one book... The book is a good one...'" Wilder D. Bancroft in the Journal of physical chemistry, Jan., 1921.

Also reviewed in Chemical and metallurgical engi neering, April 20, 1921.

Colvin, Fred H., and HENRY F. COLVIN. The aircraft handbook. A collection of facts and suggestions concerning the construction and care of planes, motors and instruments in modern aircraft. New York: McGraw-Hill Book Co., Inc., 1921. ix, 415 p. illus. 8°. $4.00. VDY (121)

Developments during and since the war have necessitated a thorough revision of this useful handbookespecially the chapters on instruments and engines. There is a new section on the International Air Laws.

Cross, C. F., and E. J. BEVAN. A textbook of paper making; containing additional matter, and in part re-written, with collaboration of J. F. Briggs. London: E. & F. Spon, Ltd., 1920. xi, 527 p. illus. 5. ed. 8°. $9.00. VMP (121)

Cross, Harold H. U. Electric lighting for cycles and motor cycles. A simply written handbook on the construction, maintenance and repair of "dry" battery, accumulator, and dynamo outfits. London: E. & F. N. Spon, Ltd., 1920. viii, 124 p. illus. 12°. 3 s. 6 d. TORB (121)

Popular and practical, this book is the result of a wide range of experience with various types of outfits. Written expressly for the amateur. First chapter introduces the essential electrical facts.

Cunningham, E. Relativity, the electron theory and gravitation. New York: Longmans, Green and Co., 1921. vii, 148 p. 2. ed. 8°. 10 s. 6 d. (Monographs on physics.) PAT (117)

First edition (1915) had the title: Relativity and the electron theory. The work is now doubled in size and covers a much wider scope in its attempt to generalize the theory of Einstein in such a way that the electron finds its natural place in the grand scheme of things.

"The book in appearance is very mathematical, although the use of formulae has been restricted as much as possible, but it also contains much interesting and readable text as well, and has been well printed and prepared."— - Wireless world, June 11, 1921.

Also reviewed in Nature, Aug. 11, 1921.

Dana, Richard T. Handbook of construction equipment, its cost and use. New York: McGraw-Hill Book Company, Inc., 1921. xv, 849 p. illus. 12°. $6.00. Desk (121)

This book with its dictionary arrangement will appeal to the man who buys, sells or has use for engi. neering equipment. It is virtually a new edition of the author's Handbook of construction plant, published in 1914, a considerable amount of obsolete material having been replaced and all prices revised as of 1920. Descriptions of apparatus and operation are unusually complete for so compact a work. Included is a classified list of manufacturers and dealers.

Eccles, W. H. Continuous wave wireless telegraphy. Part 1. London and New York: The Wireless Press, Ltd. [cop. 1921.1 vii, 407 p. illus. 8°. £1.5.0. TTF (121)

Presents theory of electromagnetism, alternating currents, oscillations, coupled circuits, transformers, and ionic tubes, in a simple way involving an elementary knowledge of trigonometry and calculus. diagrams.

306

Einstein, Albert. Relativity: the special and general theory, translated by Robert W. Lawson. New York: Henry Holt and Company, 1920. xiii, 168 p., 1 port. 8°. $3.00. PAT (115)

"The present book is intended, as far as possible, to give an exact insight into the theory of relativity to those readers who, from a general scientific and philosophical point of view, are interested in the theory, but who are not conversant with the mathematical apparatus of theoretical physics. The text is divided into three parts which deal respectively with the special theory of relativity, with the general theory of relativity, and with considerations of the universe as a whole... Since the original text came from the pen of the highest authority on the subject and since the translation has been done in a very faithful and conscientious manner, the present volume can be highly recommended to all who are interested in the epoch-making discoveries of A. Einstein.” — American journal of science, December, 1920.

Ellis, B. Eldred. Gloves and the glove trade. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. ix, 146 p. illus. 12°. (Pitman's common commodities and industries. $1.00.

VMKC (121)

Traces history and development and discusses at length: treatment of skins, dyeing and dressing of leather and processes of glove manufacture. Has excellent chapters on making fabric gloves, marketing and distributing the products, organization of British glove trade. The appendix contains a glossary of

terms.

"A most useful addition to the leather man's scanty library, as we believe it is the first British attempt

to give, in a cheap and convenient form, any available data relating to the glove industry. It is especially apropos at the present time, when there is more than a possibility of Germany again entering the field, and this useful volume should be in the hands of leather dressers, skin merchants, and others who desire to post themselves quickly on glove trade matters." The Leather world, March 31, 1921.

Faber, Oscar. Reinforced concrete design. Vol. II. Practice. New York: Longmans, Green & Co., 1920. xi, 246 p. diagrs. 8°. $6.50. VEOM (121)

Part 1 deals with the determination of bending moments in beams for various arrangements of span and conditions of loading, using the "slope" formula, Part 2 explains column moments. Part 3 treats of the properties of standard columns and beams, live load allowance for rolling goods, and of the author's researches on shear resistance, with an appendix cov. ering regulations of the London County Council. Well diagramed.

"The book is one which every reinforced concrete engineer should study; it gives designers access to tables which save much time in calculations and which must have involved the author many hours of laborious work." Concrete and constructional engi neering, Jan,, 1921.

Also reviewed in Engineering and contracting, June 22, 1921.

*Falk, K. George. The chemistry of enzyme actions. New York: The Chemical Catalogue Company, Inc., 1921. 136 p. 8°. (American Chemical Society. Monograph series.) $2.50. PPH (118)

In a movement to free Anglo-Saxon chemistry from the influence of German chemical literature, the Inter-Allied Conference of Pure and Applied Chemistry, in July, 1919, arranged with the American Chemical Society to publish a series of monographs on various subjects. The present volume is the first. Author is a member of the Harriman Research Laboratory, New York City.

"Dr. Falk's own work on enzyme action is well known and guarantees his competence to inaugurate the series. Broadly speaking, enzymes may be considered from three somewhat different points of view chemical, biological or mathematical, using this term to connote, in the author's words, 'the better understanding of the fundamental chemical relations underlying an exact knowledge of chemical reactions'; it is mainly on these lines that the review is compiled. Accordingly, the first part of the book deals with the more recent theories of chemical structure, the velocities of chemical reactions and their general theory, before specific reference is made to certain reactions catalysed by enzymes. Sections on the physical and chemical properties of enzymes lead up to a discussion of the chemical nature of certain enzymes and the mechanism of their action. A final section is devoted to their uses and applications. The whole work forms a somewhat abstruse review of present-day physicochemical theories and will repay the closest study by those interested." Journal of the Society of Chemi cal Industry, Feb. 28, 1921.

Fremont, Ch. Files and filing, translated under the supervision of George Taylor... from the French "La lime." London and New York: Sir Isaac Pitman & Sons, Ltd., 1920. xi, 148 p. illus. sq. 4°. 21 s. net.

VFV (121)

Traces the origin and evolution of the file and explains in detail correct methods of use, with discussions of force required, estimation of fatigue, efficiency, influence of various factors, etc. Also tells how files are cut, of their durability, and testing. The volume is attractively printed in square quarto with 221 excellent illustrations largely reproduced from early plates. The two sketches of cutting machines suggested by Leonardo da Vinci are noteworthy.

Reviewed in Ironmonger, Jan. 8, 1921; Work, Jan. 15, 1921.

Friese, John F. Farm blacksmithing. A textbook and problem book for students in agricultural schools and colleges, technical schools, and for farmers. Peoria, Ill.: The Manual Arts Press [cop. 1921]. 92 p. illus. 8°. $1.25. VNG (121) Describes the rougher types of work. Illustrated with 57 halftones and 30 full-page plates.

Le

*Froumenty, M., and P. BOUVIER. gantier. Paris: Dunod, 1920. x, 173 p. illus. 8°. 12.75 fr. VMKC (121)

Thoroughly covers all phases of the subject: kinds of skins used; methods of selection and treatment; processes of dyeing, cutting and sewing; embroidery; buttons, and other details of finishing. Well illustrated.

*Gardner, Henry A. Papers on paint and varnish and the materials used in their manufacture. Washington: [Author, 1920. 501 p. illus. 8°. $10.00. VOP (118)

Brings up to date the series of technical papers which the author prepared as circulars for the Educational Bureau of the Paint and Varnish Manufacturers Association of the United States. Includes researches on the properties of several oils, fume control, tests of various coatings, waterproof glues, illumination from paint, spreading rates, rare elements as pigments, quick-drying lacquer coatings, paint and varnish in the Great War, standard specifications of the War Department, and other special subjects of interest.

Giolitti, Federico. Heat treatment of soft and medium steels; theory and practice of the preliminary heat treatments designed to give maximum toughness to steels used for machine parts... Translated by E. E. Thum and D. G. Vernaci. New York: McGraw-Hill Book Co., Inc., 1921. viii, 374 p. illus. 8°. $5.00.

VIR (117)

"Metallurgists and metallographists have only recently been impressed with the fact that various impurities and addition agents may affect the prop erties of finished steel far in excess of that expected by their apparent amount. Precise data along these lines are almost entirely lacking; therefore Dr. Giolitti's present book, containing the first systematic discussion of their effect on commercial heat treatment, should prove a powerful stimulus toward their study; proving as he does the tremendous advantages to be gained by their elimination or suppression. Especially respectful attention will be given by those who have been baffled by so-called 'flakes' and 'woody fractures' a disease of metals well understood and under control in the Italian works managed by the author..." Translator's preface.

Includes an annotated bibliography of important books.

Reviewed in Mining and scientific press, Sept. 24,

1921.

Hall, Ansel F., compiler. Handbook of Yosemite National Park, a compendium of articles on the Yosemite region by the leading scientific authorities. New York and London: G. P. Putnam's Sons, 1921. xiii, 347 p. illus. 8°. $2.50. PSK (120)

This well-illustrated guide covers history, Indians, ideals and policy, administration, geology, life zones, birds, mammals, reptiles, fishes, insects, trees, the giant sequoia, flowers, camping and mountaineering, motoring and photography. References at chapter endings.

Hawley, Ralph C. The practice of silviculture with particular reference to its application in the United States. New

Tells in a simple way of the best methods of repair and restoration of freight and passenger cars, locomotives, etc., with a section on air brake work. Illustrations include some excellent plates.

*Holmes, Arthur. The nomenclature of petrology, with references to selected literature. London: Thomas Murby & Co. [1920. 284 p. 12°. 12 s. 6 d. PWR (117)

A dictionary of rocks and associated terms. When possible the originator and date of the word are given, followed by a brief characterization, name of locality, and bibliographical reference. It is stated that the only other independent work of the kind is that of Loewinson-Lessing, Paris, 1901. Appendix contains French and German terms, Greek and Latin prefixes, and classification tables.

"Gives evidence of a great amount of careful work and investigation of the complicated and scat. tered literature on the subject." — Geological maga. zine, Sept., 1920.

Also reviewed in Nature, Nov. 25, 1920; American mineralogist, Aug., 1921.

*Hopkinson, Bertram. The scientific papers of Bertram Hopkinson collected and arranged by Sir J. Alfred Ewing and Sir Joseph Larmor. Cambridge: University Press, 1921. xxvii, 480 p. illus. 4°. £3. 3 s. VFC (121)

Papers on mathematical and engineering science, collaborated as a memorial, by friends. Two biographical notices are included.

"Papers in the volume fall naturally into three main groups, dealing respectively with electrical engi neering, with certain metallurgical questions, and with the problems of the internal-combustion engine. In addition, the first paper of the series, one on sources and vortices, which was contributed to the London Mathematical Society in 1898, deserves mention as indicating the width of his knowledge and interests... Enough has been written to show the high value of the work Hopkinson did." - Nature, July 25, 1921.

Hughes, Charles H. Handbook of standard details for engineers, draftsmen and students. New York: D. Appleton and Company, 1921. x, 312 p. illus. 12°. $6.00. VDC (121)

Contains notes on drawings; tables and formulae of the various fastenings, such as bolts, nuts, screws, etc.; data on power transmission, including shaftings, couplings, bearings, pulleys, belting, gearing, pipe, tubes, rope and chain fittings; structural and other miscellaneous details. Adequately illustrated.

Reviewed in Compressed air magazine, Aug., 1921.

Humphrey, John. Drugs in commerce; their source, preparation for the market, and description. New York: Sir Isaac Pit

man & Sons, Ltd., n. d. xi, 116 p. illus. 12°. (Common commodities & industries.) $1.00. PPL (118) Briefly describes chief drugs of vegetable and animal origin listed in the British Pharmacopoeia. Jenkins, J. T. Textbook of oceanography. London: Constable & Co., Ltd., 1921. x, 206 p. illus. 8°. 15 s. PSR (115)

Sufficiently untechnical to be of interest to the general reader. Deals with extent of the ocean, its depth, deposits, fauna, temperature, properties, icebergs, atmospheric gases and salinity, with extensive chapters on waves, tides and ocean currents. Conversion tables and a brief bibliography are appended.

Judge, Arthur W. Automobile and aircraft engines in theory and experiment, being a thoroughly revised and enlarged edition of High-speed internal engines. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. vii, 642 p. illus. 8°. $8.00. VFM (121)

Practically a new book by this well known author. Concise and elementary in form, free from complex mathematics, and well illustrated.

"A considerable amount of test and scientific experimental data has been obtained during and subsequent to the late war... Extended to nearly twice its original size, owing chiefly to the addition of sections on cooling of engines, radiators, conduction, power measurement results, altitude and super-charg. ing effects, and the Still' and Diesel engines." Preface.

*Ledoux-Lebard, R., and A. DAUVILLIER. La physique des rayons X. Paris: Gauthier-Villars et Cie., 1921. vii, 441 p. diagrs. illus. 8°. PEW (117)

"The first French work to present methodically all that is known of the nature and properties of x-rays. It is not only a work which collects and coordinates the numerous foreign studies, but also presents the interesting results of personal researches by the authors as well as by the French savant M. le duc de Broglie."Radioelectricité, April, 1921.

Leggett, Bernard. Wireless telegraphy, with special reference to the quenchedspark system. London: Chapman & Hall, 1921. xv, 485 p. illus. 8°. £1.10.0.

TTF (121)

Author, an Englishman, suggests that national prejudice accounts for British lack of enthusiasm for the quenched-spark system now in extensive use in the United States, Australia, Japan, China, and Germany. He further states that no book in English has dealt adequately with the subject and that "much, including very many illustrations, has never been published in any country." The present work traces the history of wireless, but omits the names of Pupin and Heavyside. There are chapters on intensification, wireless on ships, land stations, military and aeronautical wireless, continuous wave systems, maintenance, and the propogation of electromagnetic Free of bothersome mathematics and appears to be practicable. Two hundred and thirty illustra tions. Reference lists at chapter endings.

waves.

sideration of materials and their properties, fuels, stacks, furnaces, kilns, and settings.

*Maxted, Edward B. Ammonia and the nitrides, with special reference to their synthesis. London: J. & A. Churchill, 1921. viii, 116 p. illus. 12°. 7 s. 6 d. net.

VOF (118)

"A short outline of experimental work and general principles of ammonia synthesis by a chemist who has conducted a vast amount of research on the subject. Dr. Maxted is well equipped with detailed knowledge of the work and results obtained by his foreign contemporaries, and dismisses them, if briefly, in quite an informative and interesting way. The book will be well received by people directly interested in the subject, as well as by students." - Chemical trade journal, March 12, 1921.

Also reviewed in Journal of industrial and engi neering chemistry, July, 1921.

Morecroft, John Harold. Principles of radio communication. New York: John Wiley and Sons, Inc., 1921. x, 935 p. illus. 8°. cloth. $7.50 net. TTF (121)

Complete and up-to-date work, by the Associate Professor of Electrical Engineering, Columbia University, on the theory and practice of wireless telephony and telegraphy. Intended for students well grounded in the elements of electricity.

Explains the fundamental ideas and laws; laws of oscillating circuits; spark and continuous-wave telegraphy; vacuum tubes; radio-telephony; antennae and radiation; wavemeters and their use; amplifiers.

"Practically all the theoretical deductions are substantiated by experimental data, much of which has been obtained in the author's laboratory. Also incorporated is a short course of elementary experiments which may well be carried out by electrical engineering students, especially interested in radio." Preface.

*Munby, Alan E. Laboratories, their planning and fittings...with a historical introduction by Sir Arthur E. Shipley. London: G. Bell & Sons, Ltd., 1921. xix, 220 p. illus. sq. 4°. £1.5 s. OAP (117)

"Search has not revealed any work now in print published in this country which endeavors to deal with laboratories in a manner calculated to bring a building committee, a professorial staff and their architect on common ground for what is essentially a joint undertaking. In so large a field limitations have to be decided upon, and these pages are confined to the construction of buildings and fittings for what may be termed educational science as contrasted with technical and workshop requirements. After some general remarks on initiating schemes, an attempt has been made to deal with the specific requirements of chemistry, physics, biology, and geology. This is followed by descriptions and illustrations of some recent designs of various magnitudes." Preface.

A French-English New York: John xvii, 384 p. 12°. Desk (118)

Reviewed in Nature, Sept. 29, 1921. *Patterson, Austin M. dictionary for chemists. Wiley & Sons, Inc., 1921. $3.00. "This book fills a long-felt demand for a companion volume to the same author's German-English dictionary for chemists, which has proved useful to many chemists both here and abroad. In the new work the plan of the earlier book is followed. A list of abbreviations is given, together with an introduc. tion and a valuable article on "The conjugation of French verbs." Standard works of reference have been carefully studied by the author, and opinions have been obtained from several experts in the endeavor to produce a book of value, and there can be no question of the fact that this book will assist the research man to get at facts in original text which might otherwise elude him."-American dyestuff reporter, June 6, 1921.

Also reviewed in Chemical and metallurgical engi neering, June 22, 1921.

Eager, G. F. F.

...

12°.

1921.

Longwall coal cutting machinery 1921. 109 p. illus. VHW (117) McFarlane, William. Electricity in steel works... 1921. 109 p. illus. VIR (117)

Phillips, Ernest George. Pneumatic conveying... 1921. 103 p. illus. VFG (121)

Smith, Charles F. The testing of continuous current machines... 1921. 102 p. illus. VGI (121) Trotter, A. P. The elements of illuminating engi neering... 1921. 103 p. illus. VGS (121)

*Pring, J. N. The electric furnace. London and New York: Longmans, Green and Co., 1921. ix, 485 p.. illus. 8°. $10.50. VIG (117)

This comprehensive work brings together much material scattered throughout technical books and periodicals. Traces history and sets forth the prin ciples of operation, current supply, transformers, and temperature measurement; outlines the manufacture of calcium carbide, ammonia, and the synthesis of nitrogen compounds from the atmosphere; describes the application of the electric furnace to the various branches of metallurgy and to the production of carborundum, silicon, alundum, graphite, phosphorus, and carbon bi-sulphide; discusses refractories, heat losses, electrode dimensions, design of furnace terminals, power expenditure, and water power develop. ment. Useful tables and an up-to-date classified bibliography Profusely illustrated with photographs and line drawings. Author is connected with the research department of the Royal Arsenal, Woolwich, England. Although parts of the volume are highly technical there is much to interest the general reader.

Ramsey, Jesse A., and J. ROSBLOOM. 20th century guide for marine engineers. Questions and answers. Philadelphia: David McKay Co., 1920. 537 p. 12°. $3.00.

VXHG (121)

A practical book by men of experience in the United States Navy. It covers the necessary mathe matics for the beginner. Traces the development of the steam engine, and explains boilers, piping, valves, pumps, lubricants and lubrication, the steam turbine and gas engines. 100 questions and answers on recip. rocating engines. Concludes with a short treatise on electricity. Commended by officers in charge of the Naval Engineering School at Mare Island, California.

Riegel, Robert. Merchant vessels. New York: D. Appleton & Co., 1921. xvi, 257 p. illus. 8°. $3.00.

VXH (121)

Designed to give shippers, vessel owners, ship operators, and students of ocean transportation a general idea of the relative efficiencies and economic significance of the various types of ships, their propulsion, materials of construction, structural features, and engines. Part 2 deals fully with the rules of measurement, including a chapter on safety regulations. 69 illustrations and several reading lists. Author is Professor of Insurance and Statistics in the University of Pennsylvania.

*Rougier, Louis. Philosophy and the new physics. An essay on the relativity theory and the theory of quanta. Authorized translation by Morton Masius. Philadelphia: P. Blakiston's Son & Co., 1921. xv, 159 p. 8°. $1.75. PAT (117)

A somewhat technical but clear introduction to present day scientific thought. Includes such topics as the dualism of matter and energy; mass and the relativity principle; electromagnetic dynamics; the electronic theory of matter; the inertia, weight, and

structure of energy. Has a short bibliography of French works.

Reviewed in Journal of the American Chemical Society, Dec., 1920; Faraday Society, Transactions, June, 1920.

*Russell, Edward J. Soil conditions and plant growth. New York and London: Longmans, Green & Co., 1921. xii, 406 p. 4. ed. illus. 8°. $5.00. PPE (118)

This work, formerly published in the Biochemical series and much expanded in succeeding editions is the basic volume of the new Rothamsted monographs on agricultural science which will include works by other members of Dr. Russell's staff, treating of soil physics, soil protozoa, soil bacteria, fungi and algae, and chemical changes in the soil. Bibliography is unusually complete. Dr. Russell is director of the experimental station at Harpenden, England.

*Schnabel, Carl. Handbook of metallurgy ...translated by Henry Louis. 3d ed. rev. by translator. Vol. 1, Copper, lead, silver, gold. London: Macmillan & Co., 1921. xxi, 1171 p. illus. 8°. 40 s. VIB (117)

...

Translation, with some revision, of the 2nd German edition (3rd German edition was published this year). "No book on metallurgy covers the ground so thoroughly as this volume... Here processes used all over the world are described in considerable detail, though European practice is given most prominence To American metallurgists who are looking for a good treatise on current practice, the book will be a big disappointment, for practically nothing which has appeared in the last eight or ten years and a great deal has happened The ad- is mentioned... visability of publishing this book without bringing it up to date is open to question." Engineering and mining journal, June 18, 1921. Also reviewed in Chemical age (London), June 18, 1921; Engineering, Sept. 30, 1921.

Shaw, Ben, and JAMES EDGAR. Foundrywork. A practical treatment of the fundamental principles of foundrywork for engineers, draughtsmen, apprentices and students, describing the tools, materials and practice of iron and brass foundries with examples from practice. London and New York: Sir Isaac Pitman & Sons, Ltd., 1921. xi, 115 p. illus. 12°. $1.00. VID (117) Simply written. Sixty illustrations.

Smart, Rex C. Recent practice in the use of self-contained breathing apparatus... with a foreword by Sir John Cadman. London: Charles Griffin & Co., Ltd., 1921. xiii, 243 p. illus. 8°. 15 s. VHI (117)

Although based upon the author's experiences in military mining, the book is full of suggestions for those in the industrial field. Treats of mine rescue schools, training of personnel, self-contained breathing apparatus, testing and repairing, characteristic gases in military mining, resuscitation, rescue work in the trenches, care of mice and canaries. Deals with the Proto, Salvos, and Novita apparatus only. Brief bibliography of important titles.

"The book generally is free from military jargon, and civilian readers will have no difficulty in following the text." Mining magazine, June, 1921. "The care, testing, and repairing of apparatus is fully dealt with, and this constitutes perhaps the most useful section of the volume.". Colliery guardian, May 6, 1921.

Spalding, Frederick P. Masonry structures. New York: John Wiley & Sons, Inc., 1921. x, 404 p. illus. 8°. $3.50. VEO (121)

"As a college text for students just being introduced to structural engineering this book will probably