. Scientific American Volume 92 Number 04 (January 1905) . ell beconsidered an admirable text-book on the subject of Radio-Activity. Price of Scientific American Supplements, 10 Cents by Mail foreach number mentioned. Order through your newsdealer or from MUNN & CO., 361 Broadway, NEW YORK Radio-Activity and the Electron Theory. By Sir William Crookes. Scientific AmericanSupplement 1402. The Radio-Activity of Matter. By ProfessorHenri Becquerei. Scientific American Supple-ment 1379. Some Properties of the Radio-Active Sub-stances. By Professor Henri Becquerei.Scientific American Supplement 142

. Scientific American Volume 92 Number 04 (January 1905) . ell beconsidered an admirable text-book on the subject of Radio-Activity. Price of Scientific American Supplements, 10 Cents by Mail foreach number mentioned. Order through your newsdealer or from MUNN & CO., 361 Broadway, NEW YORK Radio-Activity and the Electron Theory. By Sir William Crookes. Scientific AmericanSupplement 1402. The Radio-Activity of Matter. By ProfessorHenri Becquerei. Scientific American Supple-ment 1379. Some Properties of the Radio-Active Sub-stances. By Professor Henri Becquerei.Scientific American Supplement 142

Reading Room 2020 / Alamy Stock Photo

Image ID: 2CE428R

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

. Scientific American Volume 92 Number 04 (January 1905) . ell beconsidered an admirable text-book on the subject of Radio-Activity. Price of Scientific American Supplements, 10 Cents by Mail foreach number mentioned. Order through your newsdealer or from MUNN & CO., 361 Broadway, NEW YORK Radio-Activity and the Electron Theory. By Sir William Crookes. Scientific AmericanSupplement 1402. The Radio-Activity of Matter. By ProfessorHenri Becquerei. Scientific American Supple-ment 1379. Some Properties of the Radio-Active Sub-stances. By Professor Henri Becquerei.Scientific American Supplement 1427. Production of Helium from Radium. By Sir William Ramsay. Scientific American Sup-plement 1444. Thorium: A Radio-Active Substance withTherapeutical Possibilities. By Dr. Sam-uel G. Tracy. Scientific American Supplement1470. EVERYTHING FOR YOUAND YOUR AUTO This Horn, 12 inches long, with 4% bell, $3.00 prepaid.Other sizes equally as low-priced. Write for catalog oncomplete line of Auto supplies. THE MOTOR. CAR. SUPPLY CO., 1425 Michigan Ave., Chicag. PRACTICAL ARTICLES ON ExperimentalElectro=Chemistry By N. MONROE HOPKINS, Ph.D. Assistant Professor of Chemistry in the George WashingtonUniversity, Washington, D. C. ARE APPEARING IN THE Scientific American Supplement The articles are specially prepared for us. Theydescribe simply and clearly experiments inelectro-chemistry with easily constructed ap-paratus. Intelligible and lucid drawings andphotographs accompany the articles. The en-tire series, when complete, will constitute asplendid manual of electro-chemistry.The instruments described have been used bythe author in making the experiments that weexplain, so that every student may be assuredof their operativeness. Thus far the articleshave appeared in SCIENTIFIC AMERICAN SUP-PLEMENTS 1509, 1511, 1513, 1515.Each number of the Supplement costs 10 centsby mail. Send us $5.00 for a years subscrip-tion arid be sure to receive all the papers con-taining the articles. MUNN & CO., P