based on the third edition of Practical tanning, by Louis A. Flemming, and in many instances material has been drawn from trade journals.

Reviewed in Journal of industrial and engineering chemistry, Aug., 1922.

Russell, A. S. An introduction to the chemistry of radio-active substances. Toronto and New York: The Macmillan Co., 1922. xi, 173 p. illus. 8°. $2.00

PLE (118) "A short account of a large subject." - Preface.

Smith, Charles F. The testing of transformers and alternating current machines. The main principles and practice of efficiency and output tests on A. C. transformers, alternators, and motors with examples from practice. For students and engineers. London: Sir Isaac Pitman & Sons, 1922. xi, 91 p. illus. 12°. 85¢.

VGI (121)

Elementary outline with 34 diagrams. Steven, Alec B. Textile bleaching. London and New York: Sir Isaac Pitman & Sons [1922]. ix, 134 p. illus. 12°. $1.00. VLF (121)

Endeavors, without an assumption of chemical knowledge on the part of the reader, to point out the essential features of bleaching vegetable and animal fibres and of the preliminary operations. Author is a lecturer in the Royal Technical College, Glasgow.

*Stumpf, J. The una-flow steam engine; translated by the Stumpf Una-Flow Engine Company, Inc. Syracuse, N. Y.: Stumpf Una-Flow Engine Company, Inc., 1922. 319 p. 2. ed. illus. 4°. $4.00.

VFK (121)

Second edition, completely rewritten and brought up to date. Steam engine losses are treated in detail. There are chapters on the una-flow system as applied to the stationary engine, the Corliss engine, the rolling mill engine, the hoisting engine, the locomotive, the Locomobile and the marine engine. Profusely illustrated and has many charts and diagrams.

Reviewed in Southern engineer, Aug. 2, 1922. *Suman, John R. Petroleum production methods. Houston, Texas: Gulf Publishing Co., 1922. viii, 558 p. illus. 2. ed. 8°. $6.00. VHY (117)

Details of drilling methods, shutting off of water, operation of properties and handling of production, treating emulsions, use of electric power, pipe lines, tanks, with useful tables.

"Mr. J. A. Tennant, author of the article on the blowing of wells with compressed air, is the recog nized authority in the Southwest on this subject. The valuable discussion of the performance of rock bits in rotary drilling was written by Mr. Harold Fletcher, who is probably the most thoroughly informed man on this subject in the United States. Mr. H. R. Lucke who presents the article on Diesel engines in their application to pipe line pumping stations, is an engi neer whose ability is recognized throughout the Southwest." - Preface.

Taylor, William T. Electric power systems. A practical treatment of the main conditions, problems, facts and principles in the installation and operation of modern electric power systems for system operators, general electrical engineers and students. London and New York: Sir Isaac

Introductory work discussing general circuit conditions; the most important methods and problems in generation, transmission and distribution practice; with special attention to system operation, system factors, and operating records. Author is government electrical engineer, British East Africa.

High voltage power transformers. A practical treatment of the characteristics, construction, installation, operation, and troubles of modern high voltage power transformers, for students, station operators, and general electrical engineers. London and New York: Sir Isaac Pitman & Sons, Ltd., 1922. x, 117 p. illus. 8°. 85¢. (Pitman's technical primers.)

VGI (121)

Thomson, J. Arthur. The outline of science, a plain story simply told...in 4 volumes. v. 2. New York: G. P. Putnam's Sons, 1922. xiv, 300-564 p. illus. 8°. $3.50 a volume. O (117)

The second volume is as delightful as the first. Tells about the wonders of microscopy, the functioning of the human body, the present stand of Darwinism, of birds, mammals, insects, and the science of the mind. Copiously illustrated, partly in color.

Reviewed in Engineering and mining journal, Aug. 26, 1922.

*Tutton, A. E. H. Crystallography and practical crystal measurement. New York: The Macmillan Co., 1922. 2 v. illus. (2. ed. 8°. $25.00. PWX (117)

A year after the publication of the first edition (1911, 1 v., 946 p.) von Laue discovered that the planes of atoms in a crystal are capable of reflecting and diffracting X-rays-a basis upon which a remarkable development of crystallography has been achieved. Other investigations have also contributed to such a large extent that Dr. Tutton's work is now expanded to 1446 pages, comprising two large volumes. In addition to the material on X-rays, there are new chapters on isomorphism; polymorphism, isogonism, and enantiomorphism; thermal properties of crystals; and the electrical and magnetic properties of crystals. Several of the old chapters have been greatly expanded. The 931 illustrations are carefully executed.

"It must now inevitably have been brought home to the reader how indissolubly the subject of crystallog raphy is connected with the most important and fundamental of natural phenomena, and how deeply it concerns the student of natural science, whether he be devoting his energies to chemistry or to physics, or to their mutual borderland, physical chemistry." page 1418.

*Walker, Sir James. Introduction to physical chemistry. London and New York: The Macmillan Co., 1922. xii, 438 p. 9. ed. illus. 8°. $4.50. PLD (118)

"Notwithstanding the shortness of the period which has elapsed since the appearance of the last edition, it has been found necessary to revise many chapters, and practically to rewrite those dealing with the inti mate nature of the atom and the system of the elements."

Preface.

"It need only be said that the salient features of the new knowledge are expounded with admirable

clearness, and if the reader has a grievance, it will probably be in the nature of a complaint that Professor Walker's account of these entrancing develop. ments is all too brief... It not infrequently happens that a pioneer work of this character is superseded in the course of time by competitive treatises, but the care with which the successive editions have been revised is such that Walker's book may be said to stand almost alone in its class as an introductory exposition of the principles of physical chemistry." From a review of the 8th edition in Chemical age, London, Feb. 21, 1920.

Wall, E. J. Practical color photography. Boston: American Photographic Publishing Co., 1922. vii, 248 p. illus. 8°. $3.00. MFV

The New York Public Library has in preparation a bibliography of the extensive literature covering this subject, and therefore realizes the necessity for a "boiling down" and simple presentation of essentials. Mr. Wall, an eminent photographic chemist and contributor to the scientific and technical press, is well equipped for the task. History and difficult theory have been lightly touched upon, but methods of working the different processes are given in detail. It is stated that all of the formulas have been personally tested. Good bibliography of 3 pages.

*Warburg, H. D. Tides and tidal streams, a manual compiled for the use of seamen. Cambridge, England: University Press; New York: The Macmillan Co., 1922. vi, 95 p. illus. 8°. $2.75. PSS (117)

"An attempt has been made to give an adequate explanation of the causes of all tidal phenomena, and, whilst explaining the correct methods of using tidal information now available, to introduce improved methods of giving such information by means of harmonic constants, and to explain how, from these constants, the height of the tide may be calculated, at any port in the world and at any moment, with the necessary degree of accuracy.' Preface.

well illustrated data for the measurement of air, steam, water, and oil. Author is well known for his handbooks on natural gas and on casinghead gas.

Williams, Clement C. The design of masonry structures and foundations. New York: McGraw-Hill Book Co., Inc., 1922. viii, 555 p. illus. 8°. $5.00. VEO (121)

In this work by the Professor of Civil Engineering in the University of Kansas a knowledge of mechanics is assumed on the part of the reader. Extended discussions of moot questions and of variation in design are purposely avoided. Covers general principles, masonry laid in mortar, plain concrete, reinforced concrete, arches, dams and sea walls, retaining walls and quay walls, bridge abutments and piers, viaducts and trestles, culverts and underground conduits, bins and chimneys, forms and falsework, foundations on dry ground, open foundations under water, and the pneumatic process of constructing caissons. Attention is given to the architectural appearance of structures.

Woodbury, Walter E. Photographic amusements; including a description of a number of novel effects obtainable with the camera. Revised and enlarged by Frank R. Fraprie. Boston: American Photographic Publishing Co., 1922. 128 p. illus. 9. ed. 8°. $1.50. MFE

Originally published in 1896. Shows methods of producing magic and spirit photographs, photographs on silk and on other fabrics, silhouettes, freak pictures, caricature portraits, distorted images, moonlight effects, telephoto pictures, doubles, photographs on apples and eggs, and other unusual effects.

Worker, Joseph G. and T. A. PEEBLES. Mechanical stokers, including the theory of combustion of coal. New York: McGrawHill Book Co., Inc., 1922. viii, 258 p. illus. 8°. $3.00. VFH (121)

Tells about combustion, coal and coal producing fields of the United States, stoker development, draft, factors affecting selection of stoker equipment, determination of size, installations, specifications, contracts, guarantees, and the boiler room log. Seventeen large installations are described. 109 illustrations.

Reviewed in Power plant engineering, June 15, 1922; Steam, July, 1922.

ALLOYS: Ibbotson, 36.

AUTOMOBILES: Good, 35; Kuns, 37.
BESSEL FUNCTIONS: Gray, 36.
BLEACHING: Steven, 39.

CHEMISTRY: Grasser, 35; Henrich, 36; Ibbot-
son, 36; Kempton, 37; Lewkowitsch, 37;
Loeb, 37; Lowry, 37; Noyes, 37; Pauli,
38; Russell, 39; Walker, 39.

CIVIC SCIENCE: Hunter, 36.
COLLOIDS: Loeb, 37; Pauli, 38.
COSMETICS Askinson, 33.
CRYSTALLOGRAPHY: Tutton, 39.
DRUGS: Fuller, 35.

ELECTRICITY: Ballard, 33; Campbell, 34; Car-
ter, 34; Kraus, 37; Lewis, 37; Poole, 38;
Robinson, 38; Smith, 39; Taylor, 39.
ETCHING: Machinery's blue books, 37.

FLUIDITY: Bingham, 33.

NITROGEN: Kempton, 37.

OILS, FATS AND WAXES: Lewkowitsch,, 37.
PATTERN DRAFTING: Daugherty, 34.
PERFUMES: Askinson, 33.

PETROLEUM: Day, 34; Pan American, 38; Pe-
troleum year book, 38; Suman, 39.
PHOTOGRAPHY: Wall, 40; Woodbury, 40.
PHYSICS: Dictionary, 35.
PIPES: Pounder, 38.

PLASTICITY: Bingham, 33.

POWER PLANTS: Croft, 34.

PROTEINS: Loeb, 37; Pauli, 38.

RUSTPROOFING: Machinery's blue books, 37.

SCIENCE: Thomson, 39.

SHIPS, PROPULSION: Robinson, 38.

SPECTRA: Hicks, 36.

STEAM ENGINES: Stumpf, 39.

STOKERS: Worker, 40.

SWITCHES (Electric): Poole, 38.

TANNINS: Grasser, 35.

TELEPHONY (Wireless): Ballard, 33; Lewis,

37.

TELESCOPE: Bell, 33.

TEMPERATURE INDICATORS: Machinery's blue
books, 37.

TESTING: Batson, 33.

TIDES: Warburg, 40.

TOOLS (Metal-cutting): De Leeuw, 35.
TRACTION (Electric): Carter, 34.
TRANSFORMERS: Smith, 39; Taylor, 39.
TURBINES (Steam): Goudie, 35.
UNIVERSITIES: Caullery, 34.
VACUUM TUBES: Lewis, 37.
WOOL SUBSTITUTES: Beaumont, 33.