Embracing the most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life. Accompanied with full descriptions of Experiments, Practical Exercises, and numerous Illustrations.

BY G. P. QUACKENBOS, A.M.

12mo. 450 pages. Price $1 25.

This book, which is illustrated in the most liberal manner, is equally adapted for use with or without apparatus. It is distinguished

1. For its remarkable clearness.

2. For its fullness of illustration.

3. For its original method of dealing with difficulties.

4. For its correction of numerous errors heretofore unfortunately stereotyped in School Philosophies.

5. For its explanation of scientific principles as they appear in every-day life.

6. For its practical application of these principles in questions presented for the pupil's solution.

7. For a signal perspicuity of arrangement. One thing being presented at a time and everything in its proper place, the whole is impressed without difficulty on the mind.

8. For the interest with which it invests the subject. From the outset, the student is fascinated and filled with a desire to fathom the wonders of the material world.

9. For the embodiment of all recent discoveries in the various departments of philosophy. Instead of relying on the obsolete authorities that have furnished the matter for many of our popular school Philosophies, the author has made it his business to acquaint himself with the present state of science, and thus produced such a work as is demanded by the progressive spirit of the age.

All who have examined this book commend it in the highest terms.

"Mr. Quackenbos has long been favorably known as a teacher and also a writer of educational books. This elementary work on Natural Philosophy strikes us as being one of his most useful and happy efforts."—N. Y. Courier and Enquirer.

"A very complete system. We have been particularly struck with the conciseness and intelligible character of the definitions and explanations."—N. Y. Observer.

"It is much the most complete and instructive school-book on Natural Philosophy that we have ever seen."—Christian Union, Louisville, Ky.

"Every reasonable requirement is met in this new work."—Gazette, Pittsburg, Pa.

"The whole arrangement is decidedly superior to anything of the kind that ever fell under our inspection."—Post, Hartford, Conn.

"It places the principles and rules of philosophy within the reach of the young student in a most attractive form."—Evening Transcript, Boston.

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