Dencer, F. W. Detailing and fabricating structural steel. New York: McGraw-Hill Book Co., Inc., 1924. xiv, 512 p. illus. 8°. $5.00. VEH (121)

A discussion of engineering and shop organization, of structural designs and specifications, and a descrip. tion of methods of handling contracts, ordering material, making shop drawings, fabricating, inspecting and shipping steel. Details of practice of the various departments of structural shops are outlined.

Reviewed in Boston Society of Civil Engineers. Proceedings, Dec., 1924; Engineering news-record, Jan. 15, 1925.

Dingle, Herbert. Modern astrophysics. London: W. Collins Sons & Co., Ltd., 1924. xxviii, 420 p. illus. 8°. 30s.

ORD (Stack 3) Richly illustrated work for the general public, briefly presenting the wonders of spectroscopy, charac teristics of the stars, and varieties of cosmic bodies, with predictions on the future of the universe.

"It is assumed here that the reader is prepared to think. No specialized knowledge is required; no technical or unfamiliar language is used without explanation; mathematical formulae, when they give more precision to the statements of the text, have been placed in footnotes, and may be ignored by the nonmathematical reader.". Preface.

"But in spite of what must be regarded as defects ... we nevertheless would congratulate the author on a very difficult piece of compilation and on the production of what is, in effect, our first book dealing in a general way with the whole range of astrophysics." -Philosophical magazine, Dec., 1924.

Reviewed in English mechanic, Dec. 12, 1924. *Drysdale, C. V., and A. C. JOLLEY. Electrical measuring instruments. Part 2: Induction instruments, supply meters & auxiliary apparatus. London: Ernest Benn, Ltd., 1924. 475 P. illus. 4°. 55s. VGK (121)

Detailed information for the constructor, designer, and user. Treats of continuous current supply meters, induction instruments, recording instruments, frequency and phase meters, devices for extending the range of A. C. meters, electrical devices for mechanical testing, special indicating instruments, and testroom equipment. Copiously illustrated.

"The authors have collected together a vast amount of information in several lines. They have given very detailed historical particulars, they have added a good deal of mathematical theory, bordering on the abstruse, much of which in the particular form given is original work... A mine of information for engineers who cannot go or need not go into the finer points of instruments design."- Electrician, Jan. 9, 1925. Reviewed in Journal of scientific instruments, March, 1925.

Farnham, Dwight T., and others. Profitable science in industry, by Dwight T. Farnham, James A. Hall, R. W. King, and H. E. Howe. New York: The Macmillan Co., 1925. x, 291 p. illus. 8°. $3.50. OAP (117)

Four experts tell how science has promoted industrial efficiency. Covers the electrical industries, Xrays, chemistry, the waste problem, research, mechanical engineering, textile machinery, scientific manage. ment. Outlines the research activities of a number of industrial associations. Much of interest for the general reader.

Reviewed in Industrial and engineering chemistry, April, 1925.

Findlay, Alexander. Chemistry in the service of man. London and New York:

*Fry, Lawford H. A study of the locomotive boiler. New York: Simmons-Boardman Publishing Co., 1924. xiv, 157 p. illus. 8°. $4.00. TPE (121)

"Devoted to the physiology of the locomotive boiler, little attention being given to its anatomy or construction... A logical method of comparing tests on a simple, definite basis with a view to obtaining as much information as possible regarding the details of the processes which determine the final results... Some of the formulae look formidable, but the work is all planned to avoid any necessity for a knowledge of higher mathematics on the part of the reader." Foreword.

* Grant, Gordon, and H. B. CULVER. The book of old ships and something of their evolution and romance, wherein will be found drawings and descriptions of many varieties of vessels, both long and round, showing their development from most remote times; the portraiture of their progress, their garnishment, etc. Together with divers dissertations upon the origins of shipping; also an appendix wherein will be discovered to the inquisitive much information appertaining to the ancient uses and customs of the sea and mariners... Garden City: Doubleday, Page and Co., 1924. xxiv, 306 p. illus. 4°. $20.00. +VXH

*Hagenbach, August. Der elektrische Lichtbogen. Leipzig: Akademische Verlagsgesellschaft, 1924. xii, 282 p. 2. ed. 8°. PEW (117)

The addition of new paragraphs to the 1st ed. (1917) has increased the size by 48 pages. Treats of A. C. and D. C. arcs, temperature determination, waves, chemical aspects. Chapters on mercury electrodes and the electric oven. Literature references have been brought down to date. Author is a professor in the University of Basel.

Hausmann, Erich. Dynamo electric machinery, the theory, construction and operation of direct and alternating machines. New York: D. Van Nostrand Co., 1924. viii, 645 p. illus. 8°. $4.50. VGI (121)

Supplants the two volumes written by the present author and Dr. Samuel Sheldon, 1900-1902. Accords with modern practice and standardization, and treats of up-to-date machinery, including conversion appara Of university grade, requiring a knowledge of calculus. Numerous problems. Author is Professor of Electrical Communication, Polytechnic Institute of Brooklyn.

tus.

Hawks, Ellison. Engineering for boys. London: T. C. & E. C. Jack, Ltd., 1923. xii, 389 p. illus. 8°. 6s. VDB (121)

Copiously illustrated historical and descriptive account of ancient engineering, power, the steam-engine, turbines, railways, harbor works, lighthouses, tunnels, irrigation and water supply, canals, roadmaking, bridges, and steamships. Excellent chapter on the making of an engineer.

*Helmholtz, Hermann Ludwig Ferdinand von. Helmholtz's treatise on physiological optics, translated from the third German edition, edited by James P. C. Southall, Professor of Physics in Columbia University. v. 1. Menasha, Wis.: Optical Society of America George Banta Publishing Company, prtrs.], 1924. xxi, 482 p. illus. 8°. $7.00. PEY (117)

It

"Will gratify every student of optics in that after nearly sixty years this remarkable treatise is now for the first time accessible in an English version. It is all the more welcome since singularly enough there is no similar work of any kind in our language... is at least a debatable question whether material from other sources should be included. The German editors ... gave themselves great latitude in this regard. For example, nearly half of volume 1 consists of a supplement by Gullstrand... The translation, which was the work of many collaborators, seems most satisfacThe illustrations are the one blemish on the book. - American journal of science, Jan., 1925. Also reviewed in Journal of the Franklin Institute, Dec., 1924; Science, Aug. 18, 1924.

tory...

Hinton, Martin A. C. Rivers and lakes, the story of their development. London: The Sheldon Press; New York: The Macmillan Co., 1924. x, 182 p. illus. 12°. $2.40. PSW (117)

Untechnical account of how rivers and lakes are fed, the story of the Thames, the evolution and rivalry of rivers, and the origin of lakes. Deals largely with England and Scotland. Bibliography of books and periodical articles.

*Hiscox, Gardner D., editor. Henley's twentieth century formulas, recipes and processes, containing ten thousand selected household, workshop and scientific formulas, trade secrets, chemical recipes, processes and money saving ideas. New York: The Norman W. Henley Publishing Co., 1924. xiv, 807 p. illus. 8°. $4.00. VBA (121)

Reprint of the 1921 edition, with a new chapter on useful workshop and laboratory methods.

Hofman, Heinrich Oscar. Metallurgy of copper...revised by Carle R. Hayward. New York: McGraw-Hill Book Co., 1924. xiii, 419 p. 2. ed. illus. 8°. $5.00. VIT (117)

Revision and resetting of 1st edition (1914) show a decrease of 137 pages. Takes account of new developments, especially of the reverbatory furnace, of hydrometallurgy, and of dust prevention and recovery. Statistics are brought down to date. Dr. Hofman, who was one of America's leading metallurgists and Professor of Metallurgy at the Massachusetts Institute of Technology, died April 28, 1924.

*Hollins, Cecil. The synthesis of nitrogen ring compounds, containing a single heteroatom [nitrogen], with an introduction by Prof. J. B. Cohen. London: Ernest Benn, Limited, 1924. xiv, 423 p. 8°. £2. 15s.

POD (119)

"Provides a survey of the methods by which cyclic compounds containing a single hetero-atom (nitrogen) have been prepared. It is intended to supply, within the limits indicated in the title, complete answers to the questions: What methods are available for the synthesis of a substance of a given type and What compounds of that type have been synthesised... The references to journals and patents are carried to December 31, 1923."— Preface.

*Horenburger, F. W. Where to cruise. Charts for motor boatmen and a compilation of useful cruising information arranged for easy reference and use on board the small cruiser. Names and locations of all principal ports and harbors, compass courses, distances and sailing directions. Data based on United States Coast and Geodetic Survey charts and recognized aids to navigation. New York: Motor Boating, 1924. 128 p. 3. ed. rev. & enl. maps. 4°. $2.00.

Comprises 56 charts and 14 cruises. Covers the eastern and southern waters of the United States; also the Great Lakes.

Howe, H. E., editor. Chemistry in industry, a coöperative work intended to give examples of the contributions made to industry by chemistry. New York: The Chemical Foundation, Inc., 1924. xii. 372 p. illus. 8°. $1.00. VOE (119)

Elementary chapters by experts, dealing with the foundations of chemical industry; abrasives; alcohol and some other solvents; coal, coke, and their products; cotton and cotton products; chemistry in the electrical industry; some applications of electro-chemistry; chemistry in the fertilizer industry; industrial gases; glass; iron and steel manufacture; leather; non-ferrous metallurgy; packinghouse processes; the pulp and paper industry; perfumes and flavors; the petroleum industry; photography; synthetic resin; the rubber industry; chemistry in the textile industry. Numerous illustrations.

Huntington, Ellsworth. Civilization and climate. 3. ed. revised and rewritten with many new chapters. New Haven: Yale University Press, 1924. xix, 453 p. illus. 8°. $5.00. PRN (117)

The present edition differs from the first in several important respects: In the first edition inheritance...was dismissed briefly. In the present edition it receives a good deal of emphasis, especially in the first chapter, which is almost wholly new... The relation to climate has been much discussed.. accordingly three new chapters have been added on this topic... An especially important new feature is a study of the white man in tropical Australia.". Preface.

James, W. Wireless valve transmitters. The design and operation of small power apparatus. London: The Wireless Press, Ltd., 1924. viii, 271 p. 8°. 9s. TTF (121)

"The aim...has been to deal in turn with each portion of the complete transmitting equipment in order that the reader may be able to design and operate his own transmitter, and to derive greater benefit from the technical articles appearing in various wireless publications." - Preface.

Reviewed in Electrical review, London, Nov. 14, 1924; Engineer, Nov. 28, 1924.

Jeffrey, Harry R. Wood-finishing. Peoria: Manual Arts Press, 1924. 177 p. illus. 12°. $1.50. VEY (121)

Non-technical work adapted to the shop and to the home emphasizing the beautiful as well as the prac tical. Also has chapters on enameling, stenciling, and the refinishing of old furniture. Author is a teacher in the Kansas State Teachers' College.

Johnson, J. B. Johnson's Materials of construction, rewritten by M. O. Withy and James Aston. Edited by F. E. Turneaure. New York: John Wiley & Sons, Inc., 1925. xx, 865 p. 6. ed. illus. 8°. $6.00. VEE (121)

"Chapter xxx, on Paints and varnishes, by O. A. Hougen, and Chapter xxxI, on Constitution of some of the more important non-ferrous alloys, by R. A. Ragatz, have been added. Chapter xxvIII, on Fatigue of metals, has been completely revised. Revision has also been made of certain data on the mechanical properties of timber, of requirements for brick sewer pipe, gypsum wall plasters, and hydrated lime. Some new types of testing machines and apparatus have been substituted for older forms. Other minor changes have been made in methods of testing." - Preface. Reviewed in Engineering world, April, 1925. Joint Executive Committee of the Vocational Education Committees of the Pulp and Paper Industry of the United States and Canada. The manufacture of pulp and paper. In 5 v. v. 5. New York: McGraw-Hill Book Co., 1925. v. p. illus. 8°. $5.00. VMP (121)

The final volume of this series describes in detail paper-making machines; hand-made papers and tub sizing; paper finishing; coated papers; paper testing; general mill equipment.

Judge, Arthur W. The testing of high speed internal combustion engines, with special reference to automobile and aircraft types and to the testing of automobiles. London: Chapman & Hall, Ltd., 1924. xvi, 392 p. illus. 8°. 25s.

VFM (121) Much of a fairly elementary nature, but enough advanced matter, coupled with footnote references, to be of value to the technician and the research engineer.

Copiously illustrated. Covers general principles, test procedure, fuel tests and exhaust gas analysis, measurement of air supply, water supply and heat measurements, brake horse power, pressure measurements, indicator diagrams, temperature measurements, automobile testing, aircraft engine tests, and the analysis of high frequency movements.

Reviewed in Engineering production, Dec., 1924; Mechanical world, Feb. 27, 1925.

*Kidwell, Edgar. The Kidwell two-flow ring-circuit water tube boiler, containing a lucid explanation of the principles underlying correct boiler design and operation, their application to boiler analysis and how they are correctly applied in the design of the Kidwell boiler, with other information valuable to those who wish to generate more steam for less money. Milwaukee: Kidwell Boiler Co., 1923. 268 p. illus. 4°. VFH (121)

Although published in the interests of a commercial concern this attractive, finely illustrated volume contains a large amount of precise information on how to distinguish good boilers from bad.

Knecht, Edmund, and J. B. FOTHERGILL. The principles and practice of textile printing. London: Charles Griffen & Co., Ltd., 1924. xix, 731 p. 2. ed. rev. illus. 8°. £3. 3s. VLG (121) First edition was published in 1912. Illustrations include many actual samples.

"The present edition has been carefully revised throughout and brought up to date... The added matter includes a notice of mediaeval block printing in Europe, and descriptions of a new rubber-bowl printing machine, a new blanket-washing machine, Rawsthorne's stipple engraving machine, and "brush and drop" method of decorating textile fabrics. Additional information is also included relating to Basic, Mordant, Vat and Sulphur colours generally and to Aniline black..." - Preface.

the

Ein

*Ledebur, A. Die Legierungen in ihrer Anwendung für gewerbliche Zwecke. Hand- und Hilfsbuch für sämtliche Metallgewerbe. 6. rev. & enl. ed. bearbeitet von O. Bauer. Berlin: M. Krayn, 1924. viii, 9424 p. illus. 8°. 20 mks. VID (117)

Up-to-date revision of this well known work. Treats in a technical way, with many references, of the properties of metals and alloys, the preparation of alloys, and the most important industrial metals and alloys. Numerous microphotographs and diagrams.

Reviewed in Foundry trade journal, Nov. 20, 1924. *Lesley, Robert W. History of the portland cement industry in the United States, with appendices covering progress of the industry by years and an outline of the organization and activities of the Portland Cement Association. Chicago: International Trade Press, 1924. 330 p. illus. 8°. $3.00. VEO (121)

Covers technical and commercial development. Reviewed in Rock products, March 7, 1925; Engineer, March 6, 1925.

Lewis, Isabel Martin. A handbook of solar eclipses. New York: Duffield & Co., 1924. xi, 118 p. illus. 8°. $1.25.

OND (Stack 3) "To present in a non-technical manner some of the chief facts concerning the cause and prediction of eclipses and their scientific importance, as well as the manner in which they are observed, scientifically and otherwise. A special chapter has been devoted to the eclipse of January 24, 1925 and a considerable part of another chapter to the eclipse of June 29, 1927..." - Preface.

*Linley, C. M. Recent progress in engineering production. London: Ernest Benn, Limited, 1924. xiii, 340 p. illus. 4°. 42s. VFG (121)

Chapters on stainless steel, aluminium, physical tests, balancing, power transmission, electric furnaces, and pyrometers. 303 illustrations.

"Written with the object of keeping engineers, manufacturers of machinery, and all those who utilise mechanical plant, in touch with the latest developments and improvements in connection with machine tools, work practice, manufacturing methods, processes and alloys..." Preface.

Reviewed in Electrician, Oct. 31, 1924; Engineer, Nov. 28, 1924; American machinist, Dec. 11, 1924.

Lister, J. E. The screening and grading of materials. London: Ernest Benn, Ltd., 1924. xii, 13-144 p. illus. 12°. (Chemical engineering library.) 6s. VOF (119)

Briefly considers screens, washers, classifiers, drying machinery, air separation, electrical and magnetic separators. Describes a large number of commercial machines.

Lobeck, Armin Kohl. Block diagrams and other graphic methods used in geology and geography. New York: John Wiley & Sons, Inc., 1924. xi, 206 p. illus. obl. 8°. $4.50.

VDE (121)

The Assistant Professor of Physiography at the University of Wisconsin presents clear descriptions, with carefully prepared drawings, of methods for por. traying plains, plateaus, mountains, streams, glaciers, and waves, both perspectively and isometrically. Chapters on landscape sketching and crystal drawing. Numerous exercises for practice and a list of refer

ences.

Matasek, Ray. Drawing for zinc etching. Milwaukee: The Bruce Publishing MBB Co., 1925. 64 p. illus. 8°. $1.35.

Description of the zinc process; brief directions for drawing in crayon and in pen-and-ink, for stipple work, silhouettes, silver print drawings, spatter work, brush drawing, paper batik, the Ben Day process, and line color plates. Copiously illustrated.

Maurer, Edward R., and R. J. ROARK. Technical mechanics, statics, kinematics, kinetics. 5. ed. rewritten. New York: John Wiley & Sons, Inc., 1925. xii, 364 p. illus. 8°. $3.50. VFC (121)

The greater part of the section on statics requires no knowledge of mathematics beyond trigonometry. Kinematics and kinetics presuppose a knowledge of simple calculus. Graphical methods are used freely. Authors are professors in the University of Wisconsin.

Complete rewriting shows "improvements in the presentation; changes in subject matter; inclusion of a larger number of solved illustrative examples; addition of new problems; a better grading of all problems; and a return to the common practice of more minutely subdividing the matter into a relatively large number of articles." - Preface.

Reviewed in Engineering news-record, Jan. 15, 1925; American machinist, Jan. 29, 1925.

Millikan, Robert Andrews. The electron, its isolation and measurement and the determination of some of its properties. Chicago: University of Chicago Press, 1924. xiv, 293 p. 2. ed. illus. 12°. $2.00. PAW (117)

The reader possessing an elementary knowledge of physics should, with the possible exception of a chapter or two, make good headway with this book. Heavier mathematics are discussed in the appendix. Author is the well-known Director of the Norman Bridge Laboratory of Physics, California Institute of Technology, Pasadena, California.

"In the present edition...I have endeavored to present a simple treatment of all the developments in physics to date which have caused a modification or extension of any of the viewpoints expressed just seven years ago." - Preface.

--

Reviewed in Electrical review, London, Jan. 9, 1925; American journal of science, Jan., 1925.

The Modelmaker, for those interested in working models. V. I, 1924. New York: Spon & Chamberlain, 1924. 112 p. illus. 12°.

During 1924 this little periodical was published bimonthly. After January, 1925, it will be issued monthly at an annual rate of $1.00. Good articles on actual construction with drawings. News items, brief book reviews, and sale-exchange-wanted lists.

Nisbet, H. Preliminary operations of weaving. v. 2: Preparation of multicoloured striped warps. Manchester: Emmott & Co., Ltd., 1924. xv, 286 p. illus. 8°. 15s. VLD (121)

Volume 1 (Preparation of grey or plain warps) was published in 1914. v. 2 "completes a work which, so far as the author is aware, provides the most compre. hensive and exhaustive treatise on the preparation of plain and coloured striped warps by standard systems and by modern machinery of the most approved types." Preface.

Osborne, R.

Dictionary of natural commodities. London: Effingham Wilson, 1924. VB (121) vii, 153 p. 8°. 5s.

Covers acids, alkalis, alcohol products, cereals, fuel, minerals, oils and fats, precious metals and stones, tea, coffee, cocoa, milk, sugar, tobacco, amber, asbestos, etc. Has a list of books for further reference.

"Describes as briefly and as lucidly as possible the most important properties of the main natural commodities, so that the reader can see almost at a glance the part each one takes in present day industry... The following particulars of each commodity are given: the origin, composition, how produced, the important physical and chemical properties and the commercial application..." - Foreword.

Parrish, P., and F. C. SNELLING. Sulphuric acid concentration. London: Ernest Benn, Ltd., 1924. 2 v. illus. 12°. (Chemical engineering library. second series.) 6s. a volume. VOF (119)

v. 1: By hot gases; v. 2: In heated vessels. These processes concisely but adequately explained. Chapter on transportation of the acid. Good diagrams of plant and apparatus.

Reviewed in Colliery guardian, Dec. 12, 1924.

Pollitt, Alan A. The technology of water. London: Ernest Benn, Ltd., 1924. vii, 9– 158 p. illus. 12°. (Chemical engineering library.) 6s. VDL (121)

Treats briefly of the nature and sources of impurities, industrial waters, potable waters, and the various methods of purification; but does not describe or compare various forms of apparatus.

*Pregl, Fritz. Quantitative organic microanalysis, translated from the 2d and enlarged German edition by Ernest Fyleman. London: J. & A. Churchill; Philadelphia: P. Blakiston's Son & Co., 1924. xv, 189 p. illus. 8°. $4.00. PMN (119)

"The specific subject...is minute analysis with gravimetric determinations. The text begins with a full description of the delicate balance to be employed. All manipulations and procedures are described in great detail and numerous illustrations aid materially in the explanations... The book is a valuable introduction to a field of wide importance and interest.". Henry Leffmann in Journal of the Franklin Institute, Jan., 1925.

Rinne, Friedrich. Crystals and the fine structure of matter. Translated by Walter S. Stiles. New York: Dutton & Co., 1924. ix, 195 p. illus. 8°. $4.20. PWX (117)

Translation of the second German edition, which includes new historical details, an extended treatment of crystallography, tabular summaries and sections on the atom domain and stereochemical axes. Instructive cases of polymorphism are also described. Many new explanatory figures and portraits of some leading scientists. Much of interest to the general reader. Author is Professor of Mineralogy in the University of Leipzig.

Reviewed in Chemical and metallurgical engineering, April, 1925.

Robertson, F. A. de V. Aircraft of the world. London: Oxford University Press, 1924. 98 p. illus. 4°. 7s. 6d.. VDY (121)

Largely devoted to British aircraft and British flying activities i. e.: The Royal Air Force, commercial flying, airships, seaplanes and amphibians, gliders and light aeroplanes, aero engines, and air sport. Foreign activities are outlined. Attractive color plates.

Seymour, Hartland. Crushing and grinding machinery. London: Ernest Benn, Ltd., 1924. ix, 11-143 p. illus. 12°. (Chemical engineering library.) 6s. VOF (119)

Deals briefly with machines in common use for reducing materials to a fineness of about 10 mesh jaw breakers, gyratory crushers, crushing rolls, disintegrators and swing hammer mills, centrifugal roll mills, and ball and rod mills.

Schuhler, Albert A. Electric wiring. A text book of applied electricity for vocational and trade schools. New York: McGraw-Hill Book Co., Inc., 1924. vii, 361 p. 1. ed. illus. 8°. $2.50. VGM (121)

"...The various branches of electrical wiring have been divided into units. Each unit is composed of a systematic course, and is subdivided into jobs or exercises which are treated by means of illustrations

and descriptions. In addition, these jobs are presented in a series of successive steps, graduating in difficulty from the simplest to the most complex. Questions have been included and follow the individual jobs, facilitating the work in isolating the various jobs from one another should a shorter course be desired." Preface.

Excellent diagrams.

Reviewed in Electrical world, Dec. 13, 1924. *Silberstein, L. The theory of relativity. London and New York: The Macmillan Co., 1924. x, 563 p. 2. ed., enl. 8°. $10.00. PAT (117)

Six chapters have been added to the 1. ed. (1914), thus doubling the size of the book. Mathematics are too difficult for the average general reader.

Reviewed in Nature, March 21, 1925.

*Skelton, H. J. Economics of iron and steel, being an exposition of the everyday practice in the heavy iron and steel trades. London: Stevens & Sons, Ltd., 1924. 5 p. 1., 379 p. 2. ed., rev. & enl. illus. 4°. 20s. VIP (117)

First edition was published in 1891. Treats of British ores and the various processes for the manufacture of iron and steel, especially the latter; with descriptions of fabrication into various structural and engineering material. Chapters on pig iron warrants, testing, heat treatment, special steels, rolling mills, tolerances, scrap, nomenclature, gauges, and corrosion. Numerous tables. Designed as a non-technical help for the buyer and user.

Reviewed in Engineering, March 27, 1925.

Smith, J. D. Main. Chemistry and atomic structure, with an introduction by G. T. Morgan. London: Ernest Benn, Ltd., 1924. 221 p. illus. 8°. 12s. 6d. PLB (119)

Treats of the fundamental concepts of atoms, molecules, valency, electro-chemistry, and classification of the elements, at the same time tracing the history of the various theories; also discusses Werner's co-ordination theory, co-ordination stereo chemistry, valency and sub-atomic chemistry, radioactivity and sub-atomic chemistry, atomic physics, the dynamic atom, atomic structure and the periodic classification, atomic struc ture and the chemical properties of elements, with an appendix on the "relativity effect" on mass.

Reviewed in Scientific American, March, 1925. *Stationary engineers' blue book of facts. Examination questions, problems and their answers required for stationary engineers' and civil service examination. E. R. Glass, editor-in-chief, N. E. Wicklow, editor and consulting engineer. New York: Ocean Publishing Co., 1924. 163 p. illus. 12°. VFC (121)

$3.00.

Covers boilers, engines, pumps, safety valves injectors, shafting, fuel oil operation, electricity, refrig eration, square root examples and useful information.

Stillman, John Maxon. The story of early chemistry. New York: D. Appleton & Co., 1924. xiii, 566 p. 8°. $4.00. PKB (119)

"Tells the story of the development of chemical knowledge and science, from the earliest times to the close of the 18th century, in a connected and systematic way, not as a condensed encyclopedia, but rather by placing the emphasis upon such discoveries and speculations as have made a decided impress on the growth of the science. Thus the names of many chemists are missing which occur in the earlier his tories. None, however, of real significance...is in tentionally omitted." Preface.

Bibliography of 14 pages.

Reviewed in American journal of science, Jan.,

1925.