THE . \ 'A Tl T R E STL 'D 1 ' R E I YE 1 1 ' 



DISCONTINUING SUBSCRIPTIONS 



For the convenience of subscribers, we sent several weeks ago a memo- 

 randum of our subscription account for 1906. 



In all cases where these bills have been sent for advance subscription 

 and no reply received we have so far followed the general rule of publishers 

 and have continued the names on the mailing list so that subscribers will not 

 miss copies. We have felt sure that this was wanted, otherwise subscribers 

 would have favored us with a reply to the statement of account, or to the special 

 card sent out by the Managing Editor in December, or to the request on the 

 second cover page of all issues of this year. 



We are now compelled to change this system because the facts stated on 

 advertising page 4 of the March issue make it necessary to economize by making 

 sure that no more copies are printed hereafter than are needed for actual paid 

 subscribers. 



We are therefore compelled to announce that hereafter all names of 

 subscribers who do not order renewal will be removed from the mailing list one 

 month after notice of expiration of subscription is sent. 



If not convenient to remit when notice is received, please send a note 

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THE POPULAR SCIENCE MONTHLY 



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

 people. A complete set of the volumes thus far published is both a history of education 

 for the period covered and at thesame time a 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. 



With the increase of the importance of the applications of science 1 3 all the varied fields 

 of social life, it becomes more and more important to have a journal which will keep the 

 general public in touch with advances of scientific research and intelligently direct public 

 thinking along the avenues thus opened up. The Popular SCIENCE Monthly is perform- 

 ing this function in a most admirable way. — JOHN DEWEY, Professor of Philosophy, 

 Columbia University. 



The Popular Science Monthly has, throughout its history, accomplished a great 

 work in popularizing science and in liberalizing thought in America. Under its present able 

 management it bids fair to continue to occupy this unique field in American literature. It 

 should have the hearty support of every student and teacher. — A S. PACKARD, Professor 

 of Zoology and Geology, Brown University. 



THE POPULAR SCIENCE MONTHLY 



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"J^Thi: Popular Science Monthly will be sent for six months for one dollar for 

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