standing." Covers electrical theory and the electrical principles which are fundamental to design, development, research and technical supervision in the electrical field. Presupposes a knowledge of the calculus. Authors are professors in the University of Wisconsin and South Dakota State College respectively.

Birkhoff, George David. The origin, nature, and influence of relativity. Lowell Institute lectures, Lowell Institute, Boston, and Los Angeles lectures, University of California, Southern Branch. New York: The Macmillan Company, 1925. ix, 185 p. illus. 12°. $2.00. PAT (117)

"Perhaps the most specific contribution made lies in the foundation of a definite theory of the structure of space and time, of matter and electricity, given in Chapters vi and vii. Here are only to be found the few mathematical equations elsewhere avoided. Even the non-mathematical reader should be able to proceed from the historical and logical analysis of the basic ideas given in the earlier chapters, and read these two more technical ones, so as to perceive more clearly how these ideas can be incorporated in the terse and exact language of mathematical symbolism." — Pref

First edition was published in 1908. New edition has, in addition, new theorems and examples; the solution of linear differential equations of the second order; discussion of elliptic function formulæ; trig onometrical series, including Stokes's transformation and Gibbs's phenomenon; enlargement of the section on asymptotic series; and an account of Napier's invention of logarithms. Dr. Bromwich is Lecturer in St. John's College, Cambridge, England.

"We believe that Professor Bromwich's book contains the most complete account which has been published in English... The style of the work is exceedingly clear, so that we can recommend it without reservation as most useful addition to any mathematical library. Review of first edition in Athenæum, Aug. 1, 1908.

a

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* Bryant, Frederick J. Furniture projects. Peoria, Illinois: The Manual Arts Press, 1925. 47 p. illus. obl. 12°. Paper, 56 cents. *C p.v.

Working drawings and perspective sketches of a choice collection of furniture projects for classes in grammar grades and high schools. The period pieces are adaptations or modifications of old pieces instead of being drawings from historic pieces. They are suited to a wide range of ability. Each project is accompanied by a page of notes that cover the main points in construction. Among the pieces are a phonograph, a Hepple-white card table, mirror frames, and a gate-leg table. Author is Supervisor of Manual Arts, Auburn, Maine.

Chase, Stuart. The tragedy of waste, by Stuart Chase in connection with the Labor Bureau, Incorporated. New York: The Macmillan Company, 1925. 296 p. 12°. $2.50. TB

"Four main channels of waste, analyzed in this book, are wastes in consumption, idle manpower, wastes in the technique of production and distribution, and waste of natural resources... While from its very character a good deal of the text...is of the nature of fault finding, without prescribing remedies, some of the features are of such startling character that the industrial leaders might, with much benefit, make themselves acquainted with them.' -Iron age, Feb. 18, 1926.

*Coultas, H. W. Theory of structures, a textbook covering the syllabuses of the B. Sc. (Eng.), A. M. Inst. C. E. and A. M. I. Mech. E. and A. M. I. Struc. E. examinations in this subject. London and New York: Sir Isaac Pitman and Sons, 1925. ix, 341 p. diagrs. 8°. $4.50. VEE (121)

"Mr. Coultas is the lecturer on civil engineering at Birmingham University, and he has therefore special qualifications for writing such a work. He has done it admirably, and produced a clearly written and well illustrated book which deals very fully with the strength of beams and columns, the stresses in framed structures, in railway and road bridges of various types, retaining walls and gravity dams, and in reinforced concrete." The Surveyor, Dec. 25, 1925.

Cowdrey, Irving H., and R. G. ADAMS. Materials testing, theory and practice. New York: John Wiley and Sons, Inc., 1925. v, 129 p. illus. 8°. $1.50. VEE (121)

A small book, more general than specific, designed to accompany a laboratory course. Based on instruction in the Massachusetts Institute of Technology.

"No attempt has been made to outline in detail any particular set of tests or experiments. Rather has it been the aim to indicate basic methods of attack and interpretation."— Preface.

Reviewed in Engineering world, Dec., 1925; American machinist, Nov. 12, 1925; Machinery, Nov., 1925.

Croft, Terrell. Signal wiring. New York: McGraw-Hill Book Company, Inc., 1926. xii, 349 p. illus. 8°. $3.00. VGM (121)

Consists principally of clearly drawn circuit diagrams of a large variety of signalling apparatus, including bells and annunciators, burglar alarms, hospital and hotel signals, time and program circuits, automatic signalling, telephones, fire alarms, watchman and police calls, power stations, water flow and pressure, elevators, mines, railroads, miscellaneous signals, batteries and transformers. Has a chapter of text on methods, including the requirements of the National Electric Code.

Reviewed in Power, Feb. 23, 1926.

Crump, N. E. Copper; a survey of the sources from whence the metal is obtained, the methods of its manufacture, the nature of its uses, and the conditions of the trade. London: William Rider and Son, Ltd., 1925. vii, 246 p. 8°. 10s.6d. VIT (117)

"This book is one of a 'Raw materials of industry' series, hence the specialized reader will not turn to it with a too critical mind as regards the particular sections on which he may have expert knowledge. With this reserve, and regarding it as a book the intent of which is to give the uninitiated a general idea of all phases from which the metal is regarded, e. g., such as that of the producer, merchant, and

Dowd, Albert A., and F. W. CURTIS. Punches, dies, and gages. New York: McGraw-Hill Book Company, Inc., 1925. ix, 341 p. illus. 8°. $3.50. (Tool engineering. v. 3.) VFV (121)

"In this, the third volume, we bring our work to a close by treating the subject of dies, both forging and punch press, the design of gages for interchangeable manufacture, the limit system, modern drafting room practice, elementary pattern work, feeds and speeds and cutting lubricants; thus covering broadly the entire field as required by the modern tool engineer. Particular attention has been given to the chapters on die design because of the increasing demand for this class of work in all lines of manufacture... As in preceding volumes we deal with fundamental principles in as simple a way as possible." - Preface.

Driscoll, Daniel M. Architectural iron design and detailing (as required by the laws of New York), with an introduction by Louis Rouillion. New York: D. Van Nostrand Company, 1926. xix, 349 p. illus. obl. 8°. $4.00. VEH (121)

Treats of the detailing of stairs; miscellaneous bronze, brass, and iron; fire escapes; and the fabri cating and setting of light structural steel. Little attention, however, is given to artistic features. Numerous scale drawings. Reprints of New York's Building code, Tenement house law, Labor law, Code of ordinances, and Rules of the Board of Standards and Appeals. Glossary and tables. Author is instructor in the Mechanics' Institute of New York City.

Evers, Norman. The chemistry of drugs. New York: D. Van Nostrand Company, 1926. 247 p. 4°. $9.00. PPL (119)

Description of natural and synthetic drugs, their chemical constitution and reactions, with the chemistry, rather than the technical details, of their manufacture. Has a chapter on the relation of chemical constitution to physiological action; also lists of drugs classified into five groups. Does not treat of analysis.

*Fales, Harold A. Inorganic quantitative analysis. New York: The Century Company, 1925. xii, 493 p. illus. 12°. $3.50. PMI (119)

Abandons the usual gravimetric and volumetric arrangement and attempts to bring technique into close relation with the principles of physical chemistry. Author is Associate Professor of Chemistry in Columbia University.

"We know of no manual of analysis where so much of fact and of theory is arranged within the same space clearly, logically, compactly, but without confusion... It is, necessarily. a book for the student, the tyro... The large number of illustrations and graphs, greatly heighten the practical value; while the abundant tables in the appendix are unusual in a manual of this size." Thomas H. Norton in Chemicals, Dec. 21, 1925.

Also reviewed in American journal of science, Feb., 1926.

Faloon, Dalton B. Zinc oxide; history, manufacture and properties as a pigment. New York: D. Van Nostrand Company, 1925. x, 145 p. illus. 12°. $1.75. VOP (119)

Treats of the location and supply of zinc ores, the physical and chemical properties of the pigment, the manufacture of spelter, French and American processes of making the pigment, physical qualities and chemical specifications for all grades of zinc oxide, physical testing methods, analytical methods, and government specifications and testing methods.

"I have endeavored to tell logically the complete story of this widely used pigment, making my treatise technological rather than technical. Complex and highly technical details have been omitted and the data and facts have been arranged in an understandable manner." — Preface.

1

Reviewed in Paint, oil and chemical review, Feb. 18, 1926; Industrial and engineering chemistry, March, 1926.

Fleming, A. P. M., and H. J. BROCKLEHURST. A history of engineering. London: A. and C. Black, Ltd., 1925. vii, 312 p., 1 pl. 8°. 12s. 6d. VD (121)

"Devoted mainly to the story of engineering in England. It has chapters on docks and harbours, canals, roads and bridges, steam, railways, iron, gas and electricity, as well as a short chapter on ancient engineering. The writers, however, have mainly kept to the old well-beaten tracks." Nature, Jan. 16, 1926. Also reviewed in Engineer, Dec. 25, 1925; Ironmonger, Dec. 26, 1926.

*Ford, Louis R. Practical marine Diesel engineering. New York: Simmons-Boardman Publishing Company, 1925. xiii. 512 p. illus. 8°. $7.50. VXHG (121)

Describes practically all general types that have reached the commercial stage in the marine field, and includes introductory chapters setting forth in a simple Iway the elements of theory. Chapters on derange ments, setting cylinder head valves, ignition failures, bearing adjustments, lubrication, air compressors, indicator cards, and the details of securing an engineer's license. Copiously illustrated.

Reviewed in Oil engine power, Jan., 1926; Power, Dec. 29, 1925; Marine engineering, Jan., 1926.

*Fourneau, Ernest. Organic medicaments and their preparation... Authorized translation by W. A. Silvester... London: J. and A. Churchill, 1925. x, 262 p. illus. 8°. 15s. PPL (119)

Part 1 treats of the theoretical aspects of both the chemistry and the pharmacology of the compounds described. Part 2 describes the best methods of preparation.

"The author has limited himself to a small number of examples. He is thus enabled to deal quite fully with the chosen substances... It has the merit of arousing interest in the application of organic synthesis to practical purposes, for one is enabled to follow the train of reasoning which led the author to adopt this or that synthetic method in preparing substances of known physiological action, and the principles which guided the author in efforts to produce substances which exert specific physiological effects." Chemistry and industry, May 1, 1925.

*Gibson, A. H. Hydraulics and its applications. New York: D. Van Nostrand Company, 1925. 3. ed. xv, 801 p. illus. 8°. $6.00. VDM (121)

First edition, 1908; second edition, 1912. Third edition, largely rewritten, takes account of the rapid development during the past decade, notably of tur

bines, and of wave transmission of energy in pipe lines. Includes an added chapter on the principle of dynamical similarity and its applications to fluid motions and resistances; while the section relating to the measurement of fluid flow has been largely extended. Author states that only a slight knowledge of the calculus is necessary for a thorough grasp of the greater part of the book.

Graham, David A. Students' text book on sheet metal work with technology of sheet metal work. Brooklyn: The author, 1724 George Street, 1925. 197 p. illus. 8°. $2.50. VND (121)

Graduated course consisting of 163 plates (71⁄2" x 51⁄2") and some useful tables. Author is Instructor of Sheet Metal Work in the New York public schools.

"No descriptive matter has been considered necessary with the problems. Experience has shown that when the problems are presented to the student in the proper order, he progresses by easy steps from one principle to the next and has no difficulty in mastering the work, especially under the direction of an instructor, mechanic or foreman." - Preface.

Reviewed in Sheet metal worker, New York, Dec. 18, 1925.

Griffiths, Ezer. Pyrometers. Recent developments in pyromctric appliances and methods for calibrating temperature-measuring instruments with notes on electric furnaces. London and New York: Isaac Pitman & Sons, 1926. xi, 126 p. illus. 12°. $2.25. PDK (117)

"To serve as a connecting link between the textbooks on heat on the one hand and the advanced treatises on pyrometry on the other." Deals with types of pyrometers and their application to special purposes, rather than with design.

* Grubenmann, U., and P. NIGGLI. Die Gesteinsmetamorphose. Dritte, völlig umgearbeitete Auflage von Die kristallinen Schiefer, eine Darstellung der Erscheinungen der Gesteinsmetamorphose und ihre Produkte. 1: Allgemeiner Teil. Berlin: Gebrüder Borntraeger, 1924. xii, 539 p. illus. 4°. PWS (117)

Thorough revision and rewriting of Part I of Grubenmann's Crystalline schists, the second edition of which appeared in 1910. Now broadened to include contact metamorphism, pneumatolysis, and hydrothermal processes. Numerous bibliographies.

"This book should prove healthily stimulating to American geologists in showing them how far ahead metamorphic geology has advanced on the other side of the Atlantic." - Adolph Knopf in Economic geology, Jan.- Feb., 1926.

Gunther, R. T. Historic instruments for the advancement of science; a handbook to the Oxford collections prepared for the opening of the Lewis Evans collection on May 5, 1925. New York: Oxford University Press, American Branch, 1925. 90 p. 12°. 85 cents. OAP (117)

"Dr. Gunther has already published three finely illustrated volumes descriptive of some of the more interesting and important of the instruments, but these are necessarily expensive, while the little book that has now appeared is within the reach of all, and it gives in brief outline a general survey of the collection, together with sufficient historic notes to place the instruments in their true perspective, and to enable the general reader to form some appreciation

of the interest and value of the collection." — Nature, Oct. 3, 1925.

Also reviewed in General Science quarterly, Nov., 1925; Science progress, Jan., 1926.

Guye, Charles Eugène. Physico-chemical evolution. Translated by J. R. Clarke. New York: E. P. Dutton and Company, 1925. xii, 172 p. 12°. $2.40. OAL (117)

Translation of three essays which have appeared in scientific journals: (1) Einstein's principle of relativity in the classification of sciences; (2) The evolution of physico-chemical phenomena and the calculus of probabilities; (3) Carnot's principle and the physico-chemical evolution of living organisms. "Affords a fair view of what a statistical philosophy can contribute as to the origin and evolution of living forms of matter.' American journal of science, Jan., 1926.

Also reviewed in Journal of physical chemistry, Dec., 1925; Science progress, July, 1925; Journal of the Franklin Institute, July, 1925.

*Haas, Walter de. Fünfsprachenwörterbuch für Radioamateure. Ein Hilfsbuch zum Studium der fremdsprachlichen Radioliteratur... Stuttgart: Frankh'sche Verlagshandlung, 1924. 319 p. 8°. TTF (121)

"A great merit of the polyglot arrangement is that the various languages are not separated into different sections; thus 'practice buzzer' with its equivalents in German, French. Italian and Spanish, is immediately followed by 'Précision syntonique', with its equivalents in the other tongues." - Wireless world, May 6, 1925.

* Harding, Charles Francis. Electric railway engineering, by C. Francis Harding assisted by Dressel D. Ewing. New York: McGraw-Hill Book Company, Inc., 1926. xvii, 489 p. 3. ed. rev. & enl. illus. 8°. $5.00. TPYM (121)

Standard work last published in 1916. Third edi tion, completely revised and reset, covers theory and practice, including train operation, power generation and distribution, equipment, and types of system. New information on motor-bus transportation, automatic sub-stations, and the results of braking tests on interurban cars. Mr. Harding is Professor of Electrical Engineering in Purdue University.

Hart, Ivor B. An introduction to physical science. New York: Oxford University Press, American Branch, 1925. xii, 306 p. illus. 12°. $1.50. PAF (117)

Elementary work "intended to strike a commonsense balance between extremes" in laboratory work and theory. Numerous experiments described, with sources of error, and conclusions. Copiously and carefully illustrated.

Reviewed in English mechanic, Oct. 23, 1925.

Haslam, Robert T., and R. P. RUSSELL, Fuels and their combustion. New York: McGraw-Hill Book Company, Inc., 1926. xiv, 809 p. illus. 8°. $7.50. VHV (117)

Comprehensive and copiously illustrated work based on lecture course at the Massachusetts Institute of Technology. Treats of coal, its origin and composition, classification, spontaneous combustion and storage, resources and production, combustion on grates, handfired furnaces, stokers and furnaces, powdered coal, carbonization; of petroleum and its combustion; of producer gas, water gas, and oil gas; of furnace efficiency, flow of liquids, gases, and heat, and rate of heating. Bibliographies at chapter endings.

*Hawkins, C. C. The dynamo, its theory, design and manufacture. v. 3: Alternators. London and New York: Isaac Pitman and Sons, Ltd., 1925. ed. 6 rewritten. xviii, 572 p. illus. 8°. $8.50. VGI (121)

"The author has thoroughly revised and rewritten this standard work... Armature windings of all types, computation methods for determining voltage waves on alternators, armature reactions, construction features and complete assembly and performance data turbo-alternators are treated in the text. An additional chapter that will be welcomed treats of alternators in parallel. While written primarily from the viewpoint of the designer, the book contains valuable material for the student and also for the prac ticing engineer." · Electrical world, Dec. 12, 1925.

on

*Heaton, Noël. Volatile solvents and thinners used in the paint and varnish industries. New York: D. Van Nostrand Company, 1926. viii, 158 p. 8°. $4.50. VON (119) Contents: Petroleum hydrocarbons. Coal tar hy. drocarbons. The turpentine group. The alcohol group. Ketones and ethers. Esters. Hydrocarbon chlorides. Sulphur derivatives. General observations. Principal chemical and physical data.

"The excuse I offer is that there is no other work in the English language which brings together for reference and comparison detailed information as to the nature, preparation and properties of every solvent of industrial importance in the paint and allied industries." Preface.

Reviewed in Industrial and engineering chemistry, Feb., 1926.

Classified and well indexed clauses covering "the greater part of what would be needed for the speci fication of any residence, large or small, requiring merely such supplemental clauses as local peculiarities of site or building practices, or unusual fancies of the owner may dictate." Includes the standard form of the American Institute of Architects for the general conditions of the contract for the construction of buildings.

*Holmes, Harry N., editor. Colloid symposium monograph. Papers presented at the Second National Symposium on Colloid Chemistry, Northwestern University, June, 1924. New York: Chemical Catalog Company, Inc., 1925. vii, 368 p. illus. 8°. $5.00.

PLD (119)

Of these twenty papers the most extensive is by Hoffman and Gortner on The physico-chemical studies of proteins, a "reply to certain implied criticisms of colloid chemistry found in Loeb's book on Proteins and colloid behavior." Other contributors are Dr. Freundlich of Germany; Dr. Michaelis of Japan; and Dr. Whitby of Canada. The range of subjects is wide, including notably applications to rubber. clays, soil moisture, photographic emulsions, emulsifying agents, the supercentrifuge, bacteria as colloids, and bentonite.

*International Congress for Applied Mechanics. Proceedings of the first International Congress for Applied Mechanics, Delft, 1924. Delft: J. Waltman, Jr., 1925. xxii, 460 p. illus. 4°. VFA (121)

Of the 51 authoritative papers 12 are in English. Thirteen were delivered at the general meeting, while

38 were divided between the sections on Rational mechanics, Theory of elasticity, and Hydro- and aerodynamics. One notes among the speakers such eminent investigators as T. Levi-Civita and Sir Napier Shaw.

Reviewed in Mining and metallurgy, Jan., 1926.

* Jacobs, Friedrich Wilhelm. Fahrleitungsanlagen für elektrische Bahnen. München: R. Oldenbourg, 1925. vi, 290 p. illus. 8°. 12 mks. TPYM (121)

"It is not unusual to find German authors writing authoritative works on specialized subjects. The present book is a case in point. It deals with railway contact-line calculation and construction... The book leaves a good impression and should prove of great assistance to those interested." — Electrician, March 12, 1926.

* Jamieson, George S. Volumetric iodate methods. New York: Chemical Catalog Company, 1926. 96 p. 12°. $2.00. PML (119)

Applications of this method to the determination of antimony, arsenic, copper, mercury, molybdenum, tin, zinc, hydrazine, hydrogen peroxide, peroxide in litharge, other peroxides, dichromates, etc.; sodium thiosulphate, tetrathionates, sulphurous acids and sulphites, and the removal of chloroform soluble colored substances. Bibliography.

"The great stability of the potassium iodate solution and the remarkable sharpness of the end point of the titration are noteworthy. The non interference of many kinds of organic matter makes these methods applicable to cases in which the permanganate method could not be satisfactorily used.' Preface.

*Jeffery, Walter H. Deep well drilling. The principles and practices of deep well drilling and a hand book of useful information for the driller. Houston, Texas: The Gulf Publishing Company, 1925. 662 p. [2. ed., illus. 8°. $7.50. VHY (117)

Rewriting and enlargement of first edition (1921). The first 50 pages, dealing with the geology of petroleum and natural gas and including an extensive list of national and state publications relating to particular fields, are followed by detailed and wellillustrated instructions in the various methods of drilling, fishing, and casing, with chapters on electric drilling, shooting of wells, completion of wells, costs in various localities, strength of materials, general information, legal forms, and safety laws.

*Jones, William R. Tin fields of the world. London: Mining Publications, Ltd., 1925. xii, 423 p. illus. 8°. 30s. VHT (117)

Dr. Jones, a geologist who has had a wide professional experience in the various tin fields, deals with recent economic developments and scientific investigations as to the nature of the deposits. Chapters on smelting and mining methods. Numerous maps, cross sections, and an extensive bibliography.

Reviewed in Mining magazine, Dec., 1925; Mining and engineering journal-press, Dec. 19, 1925.

* Kearton, W. J. Turbo-blowers and compressors. A complete treatise for designers, works engineers and students, containing a full treatment of the design, construction and regulation of turbo-blowing_and_compression plant. London and New York: Isaac Pitman and Sons, 1926. xv, 333 p. illus. 8°. $6.00.. VFM (121)

Compares reciprocating and turbo types; treats of the compression of air, theory of the centrifugal compressor, losses and efficiency, cooling systems, regu lation, construction, strength of impellers, critical

speeds of shafts, testing, performance, the turbo blower as an auxiliary to the internal combustion engine, and the expansion of gases through orifices and nozzles. Numerous worked examples. Author is Lecturer in Engineering, University of Liverpool.

*Klar, M. The technology of wood distillation with special reference to the methods of obtaining the intermediate and finished products from the primary distillate. Translated by Alexander Rule, with an additional chapter by the translator. London: Chapman and Hall, Ltd.; New York: D. Van Nostrand Company, 1925. xv, 496 p. illus. 8°. $6.50. VOF (119)

"The first edition... appeared in Germany in 1903 and a completely revised second edition in 1910. The second edition was reprinted in Germany in 1920 and the present English text is a translation of the second edition... While not up to date this English translation makes more readily available a book...which contains a wealth of valid information... In spite of certain defects, the book represents a distinct addition to reference works dealing primarily with the mechanical features of wood distillation.' American journal of science, Feb., 1926.

Also reviewed in Chemical age, London, Sept. 26, 1925; Chemistry and industry, Aug. 28, 1925; Engineering, Aug. 7, 1925.

Kloeffler, Royce Gerald. Telephone communication systems. New York: The Macmillan Company, 1925. vii, 284 p. illus. 8°. $3.00. TTH

Well-illustrated text suitable for a short college course and for the worker who desires general information outside of the particular phase of his own work. Chapters on automatic systems, vacuum tubes, multiplex telephony, and radio. Author is Professor of Electrical Engineering in the Kansas State Agricultural College.

Kneeland, Frank H. Preliminaries of coal mining: prospecting, explosives, development, drainage, ventilation. New York: McGraw-Hill Book Co., 1926. vi, 419 p. illus. 8°. (Practical coal production.) $3.00. VHW (117)

Brief practical manual devoted to American practice.

Reviewed in Coal age, Feb. 4, 1926.

Koehler, Arthur, and R. THELEN. The kiln drying of lumber. Prepared in the Extension Division of the University of Wisconsin. New York: McGraw-Hill Book Company, Inc., 1926. x, 293 p. illus. 8°. $3.00. VQY (Stack 3)

Simple and accurate account of wood structure and properties; of kiln types; of heat, humidity and evaporation; with chapters on the piling of lumber in the kiln, selection, layout and construction, and operation. Authors are connected with the Forest Products Laboratory of the United States Forest Service.

* Laue, M. von, and others. Die Theorien der Radiologie, bearbeitet von M. v. Laue, P. Zeeman, H. A. Lorentz, A. Sommerfeld und G. Wentzel, Georg Joos, E. Riecke, L. Vegard, P. Debye. Leipzig: Akademische Verlagsgesellschaft m.b.H., 1925. xi, 806 p. illus. 8°. (Handbuch der Radiologie. Bd. 6.) 40 g.m. PEW (117)

"Marks the completion of the Handbuch der Radiologie, and gives a good account of the state of mathe

La Voy, Kenneth R. Problems and projects in industrial arts. Peoria, Illinois: The Manual Arts Press, 1924. 142 p. illus. 12°. $1.25. SSM

A boy's book containing simple and attractive constructional problems in bench woodworking, electricity, radio, concrete, sheet metal, and advanced woodworking, with numerous scale drawings. Although planned for shops having the average manual training equip ment, much of the work may be done in the home. Author is Instructor in Industrial Arts in the public schools of New Rochelle, N. Y.

*Lawellin, S. J., and NEWTON C. EVANS, compilers. Milling chemistry, questions and answers. Chicago: National Miller, 1925. 128 p. 12°. $1.00. PPK (119)

Much of this material has appeared in The National miller. Avoiding extremely technical terms, many questions are answered concerning wheat and its preparation; flour problems; absorption, fermentation and baking; bread troubles; protein and gluten; ash and moisture; bleaching and maturing; labora tory equipment and methods.

Luckiesh, M., and A. J. PACINI. Light and health, a discussion of light and other radiations in relation to life and to health. Baltimore: The Williams and Wilkins Company, 1926. viii, 302 p. illus. 8°. $5.00. PEB (117)

Authors, who are research experts in the General Electric Company, have sorted a large number of data and presented them in a way "best suited for general readers, mothers, nurses, public health officials and others interested in health as well as for many scientific men not specialized in the subject, including physicians, hygienists, biologists, and physi ologists." Treats of the nature of light and radiation, climate and the human race, light and life, and the relation of light to the blood, to the senses, and to the various organs of the body. Has a chapter on correct lighting.

"Their extensive investigations in the field to which the book is devoted enable them to present a very comprehensive volume, It contains an immense amount of matter of the most interesting and prac tically valuable character.". Henry Leffmann in Journal of the Franklin Institute, Feb., 1926.

*MacArdle, Donald W. The use of solvents in synthetic organic chemistry. New York: D. Van Nostrand Company. 1925. vii, 217 p. 8°. $3.50. POB (119)

A compilation similar to the well-known German works of Lassar-Cohn and of Weyl. A general discussion of solvents is followed by data on inorganic solvents; organic solvents for inorganic salts; alcohols; higher alcohols and ethers; organic acids, esters, ke tones, and bases; hydrocarbons; inert liquids; solid diluents; special means of inducing crystallization; and salting out. Bibliography of 908 titles and an index of solvents. Author is Assistant Professor of Chemistry in Boston University.

Reviewed in Chemicals, March 1, 1926.

*Martonne, E. de. Traité de géographie physique. V. 1. Paris: Armand Colin, 1925. xi, 496 p. 4. ed. rev. maps. illus. PSB (117)

8°.

This important work, crowned by the French Academy, is by the Professor of Geography in the Sorbonne. The numerous illustrations include two