Appletons' 

 Popular Science Monthly. 



Edited by WILLIAM JAY YOU MANS. 



The Topular Science {Monthly is without a 

 competitor. 



It is not a technical maga:(ine. 



It stands alone as an educator, and is the 

 best periodical for people who think, 



zAll its articles are by writers of long prac- 

 tical acquaintance with their subjects, and 

 are written in such a manner as to be readily 

 understood. 



It deals particularly with those general 

 and practical subjects which are of the greatest 

 interest and importance to the people at large. 



It keeps its readers filly informed of all 

 that is being done in the broad field of science. 



Illustrations, from drawings or pJioto- 

 graphs, are freely used in all cases in which 

 tlie text may be thereby elucidated. 



Examination of any recent number will 

 more than confirm the foregoing. 



$5.00 per annum ; single copy, 50 cents. 

 New York : D. APPLE TON & CO.. hj,^3 Bond St. 





