Part 28

Warner, E. L., 227

Wheatstone, 37

Wood grain, illusions caused by, 191

World War, 213

Wundt, 10, 11, 32, 74 illusion of direction, 79

Yellow spot, 139

Zöllner's illusion, 67, 76

Zoth, 175

OTHER BOOKS BY M. LUCKIESH

COLOR AND ITS APPLICATIONS

Second Edition, Revised and Enlarged.

6 x 9, 150 illustrations, 4 color plates, 431 pages. $4.50

The object of this treatise is not only to discuss the many applications of color, but to establish a sound scientific basis for these applications. The book is authoritative, well illustrated, and contains many references and a wealth of new material. It was written by an investigator in the general field of color and is therefore not narrowly limited in scope. It fills a distinct gap that has existed on the book shelves.

LIGHT AND SHADE AND THEIR APPLICATIONS

6 x 9, 135 illustrations, 277 pages $3.00

The book is a condensed record of several years' research by the author in the science of light and shade. It is the first published work which deals with the science of light and shade in a complete and analytical manner. The author has the faculty of bringing forth scientific facts in such a manner as to be helpful to those interested in the various arts. The book is of extremely wide interest because it deals with the appearances of objects and hence with vision and with lighting. It is well illustrated and represents the first elaborate attempt to formulate the science of light and shade and to correlate it with various arts.

ULTRAVIOLET RADIATION, Its Properties, Production, Measurement and Applications.

6 x 9, 12 plates, 270 pages $3.50

It is the primary aim of this book to present authentic data of such scope as to be useful to the chemist, physicist, engineer, biologist, ophthalmologist and physician and others interested in ultraviolet radiation. Theory has been subordinated to experimental facts because the latter are not affected by the inevitable changes in theory. Much of the literature on this subject is confusing because of the lack of care in the choice of definitions and of limited value resulting from carelessness in specifying important factors. From this mass of isolated material the author has coördinated much valuable data. The many references which are included increase the usefulness of the book.

LIGHTING THE HOME

5 x 7-1/2, illustrated, 289 pages $2.00

This is a pioneer book. It ranks with books on interior decoration and furniture as a help toward transforming a house into a home. It is practical in that it offers advice on all sorts of lighting problems and it is fascinating reading as well.

ARTIFICIAL LIGHT, ITS INFLUENCE ON CIVILIZATION

6 x 9, illustrated, 366 pages $3.00

This story of the achievements of artificial light is written especially for the man in the street who is not interested in technical scientific terms and formulae, but who looks with admiration upon the huge signs which flash and sparkle above the crowds on the Great White Way, who marvels at the colors and brilliance of a spectacular theatrical production and desires to know how it is accomplished, and who takes a natural delight in hearing about scientific discoveries when they are explained in the simple, vivid language he understands best.

THE LIGHTING ART, ITS PRACTICE AND POSSIBILITIES

6 x 9, illustrated, 229 pages $2.50

This book discusses lighting as engineering plus art, and treats the subject as a branch of interior and exterior decoration. The technical aspect of the subject is not neglected, but the main emphasis is upon the "why" and not merely the "how" of lighting.