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What the Press says of "Experimental Science."

"Mr. Hopkins has rendered a valuable service to experimental physics."—Evening Post.

"The book is one of very practical character, and no one of a scientific turn of mind could fail to find in its pages a fund of valuable information."—Electric Age.

"The work bears the stamp of a writer who writes nothing but with certainty of action and result, and of a teacher who imparts scientific information in an attractive and fascinating manner."—American Engineer.

"It should be found in every library."—English Mechanic.

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Mr. Thomas A. Edison says: "The practical character of the physical apparatus, the clearness of the descriptive matter, and its entire freedom from mathematics, give the work a value in my mind superior to any other work on elementary physics of which I am aware."

Prof. D.W. Hering, University of the City of New York, says: "I know of no work that is at the same time so popular in style and so scientific in character."

Prof. W.J. Rolfe, of Cambridgeport, Mass., writes: "The book is by far the best thing of the kind I have seen, and I can commend it most cordially and emphatically."

Hundreds of cordial recommendations from eminent Professors and Scientific men.

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Comprising five books, as follows:

Arithmetic of Electricity, 138 pages.$1.00Electric Toy Making, 140 pages.1.00How to Become a Successful Electrician, 189 pp.1.00Standard Electrical Dictionary, 682 pages.3.00Electricity Simplified, 158 pages.1.00

HandThe above five books by Prof. Sloane may be purchased singly at the published prices, or the set complete, put up in a neat folding box, will be furnished to Scientific American readers at the special reduced price ofFive dollars. You save $2 by ordering the complete set.Five volumes, 1,300 pages, and over 450 illustrations.

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