Popular Science Monthly
239 Fourth Ave., New York
Waldemar Kaempffert, Editor
POPULAR SCIENCE MONTHLY is issued monthly. Yearly subscription in the United States $1.50. Canada, $2.00. Foreign $2.50. SINGLE COPY, 15 cents. POPULAR SCIENCE MONTHLY may be had at all news stands in the United States and Canada; also from the International News Company, Breams Bldg., Chancery Lane, London. E. C., and at Brentano’s, 37 Avenue de l’Opéra, Paris. Forms close the twenty-fifth of the second month preceding date of publication. Advertising rates on application. Entered as second class matter at the New York Post Office, under the Act of Congress of March 3, 1879. The contents of this Magazine are copyrighted and must not be reprinted without permission. H. J. Fisher, President; R. C. Wilson, Vice-President; O. B. Capen, Secretary and Treasurer.
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