BOOK REVIEWS.
[J. F. I.
friction, machines, and work and energy. The sequence through the study of heat is not much different from other texts, and sound is similar. Book two is the larger part of the work. It gives a good conception of the character of light, its reflection and refraction. Spherical mirrors are taken up followed by lenses and optical instruments which leads to spectrum analysis and polarization. The study of magnetism is followed by a rather complete coverage of electricity. Here the elements of electricity are given attention as well as generators and motors, conduction of electricity through gases, radio activity, and radio telegraphy, telephony, television and the electron microscope. The last part of this book is devoted to modern physics wheremodern ideas are introduced.
The author has given a great deal of attention to the simpleness of treatment, accomplishing much in preventing mysteries which may arise in the mind of the student. Illustrative, worked out problems are given which assist greatly in understanding the subject matter. Another feature worthy of note is the size and style of type in which the book is printed. It adds greatly to ease in reading and the order of vision in the mind of the subject matter. R. I-I. OPPERMANN.