r 



The Popular Science Monthly 



EDITED BY PROFESSOR J. McKEEN CATTELL 

 Columbia University 



With the Cooperation of the Leading American Men of Science 



For more than thirty years The Popular Science Monthly has been the standard 

 scientific magazine of the world. It should be found : 



i. In every library, where in fact it will nearly always be found. The recently 

 published lists of magazines in the Chicago and Washington libraries show that the 

 Monthly is subscribed for by more libraries than any other magazine. The New York 

 Public Library takes 35 copies. The publishers -would be pleased to learn the names of 

 any libraries in which the Monthly cannot be found. 



2. In the hands of scientific men, who wish to follow the general forward movement 

 of science. He who only knows his own science does not know that. Men of science must 

 keep in touch with the general public, and can do so by reading a magazine that represents 

 the best that the public can read and understand. They should not merely read the 

 Monthly in a library ; they should own it, keep it, and bind it. 



j. In the offices of physicians and other professional men. It is for the advantage 

 of both the physician and his patients that they should be permitted to see and read a 

 magazine representing the best ideals of science rather than the fiction and supeificial 

 science found in most magazines. A hundred thousand American physicians would find 

 a subscription to the Monthly a desirable investment. 



4. In every home of intelligent and cultivated people. Even when the head of the 

 family has but little time for reading, there are older children whose taste must be formed, 

 who should learn to discriminate the true from the false, who should become acquainted 

 with science, the most important factor in modern civilization. 



The publishers of The Popular Science Monthly might be expected to over- 

 estimate the importance of a journal in which they are interested. Instead of praising it 

 they prefer to show its character by quoting the titles of some of the articles that have 

 appeared in recent volumes. They believe that those familiar with science will recognize 

 these articles to be timely and interesting , and will know that the authors write with 

 authority, being among the'Jeading American and foreign, men of science. Indeed, the 

 publishers do not ?ieed to insist on the merits of the journal, for these are acknowledged 

 by all who are competent to judge, and are adequately expressed by the authoritative 

 opinions quoted below. 



THE SCIENCE PRESS 



Publishers 



Sub-Station 84, New York City 



Annual Subscription, $3.00 Single Numbers, 30 cents 



