öperation of Dr. Matos, shows much rewriting and revision, especially concerning textile fibres, coal-tar distillation and products, dyes, bleaching, dyeing, textile printing, cellulose, paper making, cellulose esters, wood distillation, petroleum and oil shale, hydrogenation and polymerization of fixed oils.

Reviewed in Journal of the Franklin Institute, May,

1923.

*Seem, Warren P. Raw silk properties, classification of raw silk and silk throwing. New York: Silk Publishing Co. [cop. 1922.1 336 p. illus. 8°. $5.00. VLN (121)

Part 1 deals largely with defects; part 2 with classification, winding, size, measurement, and the classification of organzine; part 3 with throwing, winding, spinning and other operations. Thorough and comprehensive. Author aims to present "a basis for scientific management and to break away from traditional methods and finger and thumb rule."

*Sloane, T. O'Conor. Electric toy making for amateurs. This work treats of the making of electrical toys, electrical apparatus, motors, dynamos and measuring instruments, and is designed to bring within the reach of young and old the manufacture of genuine and useful appliances. 21. ed. rev. & enl. New York: The Norman W. Henley Publishing Co., 1923. viii, 254 p. illus. 12°. $1.50. VNR (121)

Exceeds last ed. (1914) by 44 pages.

Smith, Alpheus W. The elements of applied physics. New York: McGraw-Hill Book Co., 1923. xiv, 483 p. illus. 8°. $3.00. PAF (117)

"Meets the needs of students interested primarily in the practical applications of physics... Presents fundamental physical principles intimately and concretely, and includes a large number of illustrations of the applications of physics to agriculture, engineering and everyday life." Announcement.

*Spurr, Josiah Edward. The ore magmas, a series of essays on ore deposition. New York: McGraw-Hill' Book Co., 1923. 2 v. 8°. $8.00, not sold separately.

VHB (117)

"Here is a record rich in facts culled from the broad experience of an active man with a keen mind; and his interpretation of conditions as he has found them must command the respectful consideration of every mining geologist -and of every geologist, for that matter. The book is neither dogmatic nor controversial in tone, but maintains throughout the openminded scientific attitude with remarkable success." J. Volney Lewis in Engineering and mining journalpress, July 7, 1923.

Stanley, Rupert. Text-book on wireless telegraphy. v. II: Valves and valve apparatus. 2. ed. London and New York: Longmans, Green & Co., 1923. xi, 394 p. illus. 8°. $5.00. TTF (121)

New material concerning modern types of apparatus, high-speed signalling, recorder reception, short wave signalling, and directional apparatus, and the Armstrong method of super-audio heterodyne reception.

"The work is, however, thoroughly up to date, and taken in conjunction with the first volume [new ed., 1919], in which the principles of wireless telegraphy are fully explained in accordance with the ether-strain theories of electricity and magnetism, it is worthy of being regarded as the standard text-book on the subject."-Shipbuilding and shipping record, March 1,

1923.

Also reviewed in Electricity, April 6, 1923

Stillman, Albert L. Briquetting. Easton, Pa.: Chemical Publishing Co., 1923. x, 466 p. illus. 8°. $6.00. VHV (117)

Copiously illustrated account of raw materials; presses; the briquetting of steel swarf and turnings, cast iron borings, non-ferrous metals, wood waste, peat, lignite, coal, ores, and flue dust; a discussion of binders; a chronology of fuel briquetting in the United States; and laboratory research. Bibliogra. phies and lists of patents at chapter endings.

"Of particular interest, as it presents the subject for the first time from the American standpoint, and gives the result of the author's many years of experi ence." ." — Machinery, March, 1923.

Also reviewed in Coal industry, Feb., 1922; Canadian mining journal, Feb. 16, 1923; Iron trade review, Feb. 15, 1923; Chemical age, London, March 31, 1923.

Stone, Paul McDowell. Electricity and its applications to automotive vehicles. New York: D. Van Nostrand Co., 1922. xvi, 844 p. illus. 8°. $4.00. TON (121)

Elementary principles of electricity and various types of equipment developed with simple arithmetic and clear diagrams. Chapter on trouble shooting. Full details of important systems. Author is Assistant Principal, Michigan State Automobile School.

Strickland, F. Motor boats, a review of the development and construction of marine motors and motor boats, their advantages and their future scope. London & New York: Sir Isaac Pitman & Sons, Ltd. (1922. ix, 116 p. illus. 12°. $1.00. (Pitman's common commodities & industries.) VXHN (121)

Explains in untechnical language how the motor works, but gives no instruction in designing or building the boat.

*Truscott, S. J. A text-book on ore dressing. London and New York: Macmillan & Co., 1923. xi, 680 p. illus. 8°. $11.00. VIB (117)

Up-to-date, comprehensive, and fairly detailed. Author is Professor of Mining at the Royal School of Mines, London.

"Professor Truscott has rendered the mining community a distinct service in producing it, and it can be said without any hesitation that he has performed very well indeed his difficult task. This is not to say that the work is in all respects satisfactory; no work on ore-dressing ever has been or perhaps ever will be, and none has probably ever succeeded in satisfying even its author.' Henry Louis in the Mining maga. zine, April, 1923.

Vickers, Charles. Metals and their alloys; a modern practical work dealing with metals from their origin to their useful application both individually and as parts of alloys used where strength, ductility, toughness, lightness, color, hardness, cheapness, conductivity, or bearing properties are demanded... New York: Henry Carey Baird & Co., Inc., 1923. xix, 767 p. illus. 8°. $7.50. VIB (117)

Although based upon Brannt's Metallic alloys, "the superstructure is new" with double the number of illustrations, including sectional views of apparatus, half-tones and drawings of furnaces, and microphotographs. Chapters on die-castings, soft solders and brazing alloys, surface coloring of alloys, foundry utilization of scrap metals, and analysis of Babbitt metals.

Reviewed in Iron trade review, April 12, 1923. Walker, William H., and others. Principles of chemical engineering. New

York: McGraw-Hill Book Co., 1923. ix, 637 p. illus. 8°. $5.00. VOE (119)

"We have selected for treatment basic operations common to all chemical industries, rather than details of specific processes, and so far as is now possible, the treatment is mathematically quantitative as well as qualitatively descriptive. We venture to hope that the book will stimulate engineers to design apparatus adapted for any particular purpose, rather than just to build it and then to rely on large scale experimentation with expensive changes in construction to effect efficient operation." Preface.

For a symposium review see Chemical and metallurgical engineering, May 28, 1923.

Welch, R. L. Elements of sheet metal work. Milwaukee: Bruce Publishing Co., 1923. 121 p. illus. 8°. 90¢. VND (121)

To be accompanied by demonstrations of instructor in vocational or trade school. Fundamental shop processes, methods of drafting patterns, names of various articles of equipment, information relative to supplies, and the general content of a course of instruction. 117 illustrations (including many plates). Author is a teacher in the Stout Institute, Menomonie, Wisconsin.

*Werner, Emil A. The chemistry of urea. The theory of its constitution, and of the origin, and mode of its formation in living organisms. London and New York: Longmans, Green & Co., 1923. xii, 212 p. 8°. $4.75.

(Monographs on biochemistry.)

"An attempt has been made to give a comprehensive account of the chemistry of urea, from the date of its isolation to the present time, including all the experimental and theoretical evidence which it is hoped will convince others that an erroneous conception has undoubtedly prevailed amongst chemists in assuming urea to be carbamide." - Preface.

Extensive chronological bibliography.

White, Percival. Motor transportation of merchandise and passengers. New York: McGraw-Hill Book Co., 1923. vii, 486 p. illus. 8°. $4.00. TON (121)

Practical guide to the economical operation and maintenance of trucks and buses from all angles except the strictly engineering; with chapters on taxicabs, cost accounting, insurance, traffic and the highway, highway construction and maintenance, and the economic development of highway transport.

Whyatt, H. Gilbert. Streets, roads and pavements; a treatise on the materials, equipment, and methods employed in the construction and maintenance of roads and footways, with notes on dust prevention,

road wear, street cleansing, arterial roads and road planning for engineers, students, and all those concerned with the construction and upkeep of highways. London and New York: Sir Isaac Pitman & Sons, Ltd., 1923. x, 140 p. illus. 12°. (Pitman's technical primers. no. 65.) 85¢. VDG (121)

Willis, P. F. Oxy-acetylene welding and cutting, including information on acetylene, oxygen, electric welding. A practical and complete work on the use and maintenance of apparatus, and the welding of various metals including special castings and parts... New York: The Norman W. Henley Publishing Co., 1923. vii, 254 p. illus. 12°. $1.50. VID (117)

Reviewed in Compressed air magazine, April, 1923; Machinery, March, 1923; Iron trade review, Feb. 15, 1923.

Wilson, John Arthur. The chemistry of leather manufacture. New York: The Chemical Catalog Co., Inc., 1923. 343 p. illus. 8°. (American Chemical Society VMK (121)

monographs.) $5.00.

"The chemistry of leather manufacture is progressing more rapidly now than at any previous time. Much of the earlier work failed to recognize the existence of important variable factors and has been rendered obsolete by recent investigations carried out under more highly refined conditions. In preparing this monograph, it was found necessary, for the purpose of correlating existing data, to conduct many special investigations and these are being reported here for the first time. Advance information on investigations under way in other laboratories has been obtained, wherever possible, so that the presentation might be made reasonably complete to the close of the year 1922." Preface.

Wright, Thomas. The romance of the shoe, being the history of shoemaking in all ages, and especially in England and Scotland. London: C. J. Farncombe & Sons, Ltd., 1922. xvi, 323 p. illus. 8°. 12s. 6d. VMKB (121)

Comprehensive, with excellent plate illustrations. Modern methods briefly described; list of shoe trade periodicals; and a chapter of anecdotes, wit and humor.

"On every page, however, I have endeavoured to bring into prominence the personality and the psy chology of the shoemaker; and the more I have studied this good fellow the more I have felt drawn to him." Preface.

ENGINEER'S YEAR-BOOK: Kempe, 23.
ESTIMATING: Joslin, 22.
EXCAVATION: Massey, 24.
FATS: Lewkowitsch, 23.

FOUNDATIONS (Machinery): Croft, 20.
FUELS (Motor): Leslie, 23; North, 24.

GEARING: Logue, 23.

GELATINE: Alexander, 19.

GEOLOGY: Fox, 21.

GLASS: Powell, 24.

GLUE: Alexander, 19.

HATS (Straw): Inwards, 22.

HEATING: Call, 20; King, 23.

HEATING (Electric): Beauchamp, 19.
HIGHWAYS: Chatburn, 20.

INK: Mitchell, 24.

LEATHER: Wilson, 26.

LIGHTING (Incandescent gas): Levy, 23.

MACHINERY: Mease, 24.

MATERIALS (Strength): Leigh, 23.
MECHANICS: Leigh, 23.

METALLURGY: Barba, 19; Evans, 21; Trus-
cott, 25; Vickers, 25.

METALS (Crystallization): Belaiew, 19.

METAL-WORK: Kittredge, 23. Neubecker, 24;
Welch, 26.

MOTORS (Electric): Control, 21.
MOUNTAINEERING: Associated, 19.

NOISE (Prevention): Eason, 21.

OILS: Lewkowitsch, 23.

OPTICAL INSTRUMENTS: Atkinson, 19; John-

son, B. K., 22.

ORES: Spurr, 25; Truscott, 25.

PATTERN-MAKING: Hanley, 22.

PAVEMENTS: Whyatt, 26.

PETROLEUM (Refining): Bell, 19; North, 24.
PHASE RULE: Findlay, 21.

PHYSICS Smith, 25.

PHYSICS (Dictionary): Dictionary, 20.
PLUMBING: Call, 20.

RADIO: Stanley, 25.

RELATIVITY: Birkoff, 19; Eddington, 21.

SAP (Ascent of): Bose, 19.
SCIENCE: Dendy, 20.

SEWERAGE: Folwell, 21.

SHOES (History): Wright, 26.
SILK Seem, 25.

STEEL: Burnham, 20.

STREETS: Whyatt, 26.

STRUCTURES: Hool, 22.

TELEGRAPH (Printing): Harrison, 22.
TESTS (Electrical): Johnson, 22.
TEXTILES: Denny, 20.

TOOLS (Machine): Dowd, 21.

Toys (Electric): Sloane, 25.
TRANSFORMERS: Reed, 24.

TRANSPORTATION: Chatburn, 20; White, 26.
UREA: Werner, 26.

VENTILATION: New York, 24.

VIBRATIONS (Prevention): Eason, 21.

WAXES: Lewkowitsch, 23.

WELDING: Willis, 26.

WOOD DISTILLATION: Hawley, 22.