MUNN & CO., 361 BROADWAY, NEW YORK. * * * * * EXPERIMENTAL SCIENCE. BY GEO. M. HOPKINS. SEVENTEENTH EDITION, REVISED AND ENLARGED. 840 PAGES. 800 ILLUSTRATIONS. ELEGANTLY BOUND IN CLOTH. PRICE, BY MAIL, POSTPAID, $4.00; HALF MOROCCO, $5.00. This is a book full of interest and value for teachers, students and others who desire to impart or obtain a practical knowledge of Physics. This splendid work gives young and old something worthy of thought. It has influenced thousands of men in the choice of a career. It will give anyone, young or old, information that will enable him to comprehend the great improvements of the day. It furnishes suggestions for hours of instructive recreation. WHAT THE PRESS SAYS OF "EXPERIMENTAL SCIENCE." [Illustration] "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._ "The book would be a most judicious holiday gift."--_Engineering and Mining Journal._ 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. MUNN & CO., 361 BROADWAY, NEW YORK. * * * * * A COMPLETE ELECTRICAL LIBRARY BY PROF. T. O'CONOR SLOANE, Comprising five books, as follows: ARITHMETIC OF ELECTRICITY, 138 PAGES. $1.00 ELECTRIC TOY MAKING, 140 PAGES. 1.00 HOW TO BECOME A SUCCESSFUL ELECTRICIAN, 189 PP. 1.00 STANDARD ELECTRICAL DICTIONARY, 682 PAGES. 3.00 ELECTRICITY SIMPLIFIED, 158 PAGES. 1.00 [Hand->]The 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 of FIVE DOLLARS. You save $2 by ordering the complete set. FIVE VOLUMES, 1,300 PAGES, AND OVER 450 ILLUSTRATIONS. [Hand->]Send for full table of contents of each of the books.