THE POPULAR SCIENCE MONTHLY 
Edited by PROFESSOR J. McKEEN CATTELL 
WITH THE CO-OPERATION OF THE LEADING AMERICAN MEN OF SCIENCE 
For more than thirty years THE PopULAR SCIENCE MONTHLY bas been the standard scientific 
magazine of the world. Itshould be found in every library, in the hands of scientific men, in the 
offices of physicians and other professional men and indeed in every home of intelligent and 
cultivated people. The publishers do not need to insist on the merits of the journal for these are 
acknowledged by all who are competent to judge. The following may be quoted as typical opinions: 
“* Especially important in free public libraries.’’—J. S. BiL.tncs, Director of the Consolidated Libraries, New York City. 
** Of great utility.”’—S. P. Lanctey, Director of the Smithsonian Institution, 
** Most valuable in keeping busy men abreast of th imp t ad f sci "_A, W. GREELY, General, 
UiSch 
‘The newest and best that can be said on any subject.”’—Witiis L. Moore, Chief of the U, S. Weather Bureau. 
. . . - PS . . . h. 
“It has done more for the diffuson of scientific information in this country, during the past twenty y 
other one agency.”—GrokGE M. STERNBERG, Surgeon General, U.S. A. 
e . . . . . . al 
iia The most instructive and most enjoyable scientific journal which I have seen anywhere, here or abroad. Hyco 
MUnsTERBERG, Professor of Psychology, Harvard University, ‘ 
i ly that hall d a new set.””—E, A, STRONG, Professor of Physics and Chemistry, 
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“Tt has had few rivals and no equal in the educative service it has done for the American people. A complete wis 
the volumes thus far published is both a history of science for the period covered and at the same time a Prey eT 
clopedia of natural science. There is nothing to fill its place, and to carry it on is a | I “aa 
ARRis, U. S, Commissioner of Education, 
“go cents eer cory THE SCIENCE PRESS, sua-starion 84, nEW yOR« ti 
THE POPULAR SCIENCE MONTHLY will be sent for SIX MONTHS for ONE DOLLAR to new subscrit 
SS 
{B the flood of books pouring daily from the press there 1s s0 
much to choose from that no person can, unaided, judge 
what should be read and what left unread. Hence a journa ass 
may be steadily trusted as a safe and agreeable guide tot : 
character, the contents, the merits and demerits, of the ae 
tant new books, is obviously of the greatest value to phe gem 
literary inclinations or pursuits. Such a journal THE ie ry 
long been known to be. Established for over a que as 
it is generally recognized by the highest critical senna 
“the leading literary journal of America.” In its pages ‘thout 
books are described and discussed upon their merits, wi tty. 
fear or favor, by the ablest scholars and critics in ai asi in 
To all who need a trustworthy and independent guide 
the complex field of current literature Tue D1at is indispe 
——_—— ; pial 
For the purpose of introducing PH ihe 
VERY SPEGIAL OFFER £20728 
will mail to any person, not numbe® 
to the paper a of 
. : msecultve 
in who will send 10 cents and mention this advertisement, i we 4 by the accept - 
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THE DIAL, No. 203 MICHIGAN AVENUE, CH 
