T H E 



Popular Science Monthly 



Especially important in free public libraries. — J. S. Billings, Director of the Consolidated Libraries, N. Y. City. 



Of great utility,— S. P. I,angley, Director of the Smithsonian Institution. 



Unique among scientific journals. — T. C. Mendekhall, lately President of the Worcester Polytechnic Institute. 



The latest and best in a most attractive form.— Rob't H.Thurston, Director of Sibley College, Cornell University. 



Most valuable in keeping busy men abreast of the more important advances of science. — A. W. Greely, 

 General, U. S. A. 



The newest and best that can be said on any subject. — Willis L. Moore, Chief of the U. S. Weather Bureau. 



It has done more for the diffusion of scientific information in this country during the past twenty-five years 

 than any other one agency. — Geohg.e M. Sternbekg, Surgeon General, U. S. A. 



The most instructive and most enjoyable scientific journal which I have seen anywhere, here or abroad. — 

 Hugo Munsterberg, Professor of Psychology, Harvard University. 



I refer to it so constantly that we shall soon need a new set. — K. A. Strong, Professor of Physics and Chemistry, 

 State Normal College, Ypsilanti, Mich. 



It has had few rivals and no equal in the educative service it has done for the American people. A complete 

 set of the vohunes thus far published is both a history of science for the period covered and at the same 

 time :i pretty complete cyclopedia of natural science. There is nothing to fill its place, and to carry it on 

 is a benefaction to the public. — W. T. Harris, U. S. Commissioner of Education. 



THE POPULAR SCIENCE MONTHLY will be sent to new subscribers for six months for One Dollar. 

 Single Numbers, 50 Cents Yearly Subscription, $3.00 



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