THE POPULAR SCIENCE MONTHLY 



CONBTJCTED BY 



E_ L_ "2- O TJ JVC .A. n>T S . 



This periodical was started {in 1872) to promote the diffusion of valuable sci- 

 entific knowledge, in a readable and attractive form, among all classes 

 of the community, and lias thus far met a want supplied by 

 no other magazine in the United States. 



Eight volumes have now appeared, which are filled with instructive and interesting 

 articles and abstracts of articles, original, selected, translated, and illustrated, from the 

 pens of the leading scientific men of diff'erent countries. Accounts of important scien- 

 tific discoveries, the application of science to the practical arts, and the latest views put 

 forth concerning natural phenomena, have been given by savants of the highest au- 

 thority. Prominent attention has been also devoted to those various sciences which 

 help to a better understanding of the nature of man, to the bearings of science upon 

 the questions of society and government, to scien,tific education, and to the conflicts 

 which spring from the progressive nature of scientific knowledge. 



The Popjjlae Science Monthlt has long since ceased to be an experiment. It 

 has passed into a circulation far beyond the most sanguine hopes at first entertained, 

 and the cordial and intelligent approval which it has everywhere met, shows that its 

 close and instructive discussions have been well appreciated by the reading portion of 

 the American people. It has not been its policy to make boastful promises of great 

 things to be done in the future, but rather to appeal to what it has already accom- 

 plished as giving It a claim upon popular patronage. But no pains will be spared to 

 improve it and make it stUl more worthy of hberal support, and still more a necessity 

 to the cultivated classes of the country. 



The PoptTLAR Science Monthly is published in a large octavo, handsomely printed 

 on clear tj-pe, and, when the subjects admit, fully illustrated. Each number contains 

 12i pages. 



Terms : S5 per Annum, or Fifty Cents per Number. 



Postage free to all Subscribers in the United States, from, January 1, 1875. 



A new volume of The Populae Science Monthly begins with the numbers for 

 May and November each year. Subscriptions may commence irom any date. Back 

 numbers supplied. 



JVoio Ready, Vols. /., //., ///., IV., F-, VI., VII., and VIII, of the Popular 

 Science Monthly, embracing the numbers from 1 to 48 (May, 1S72, to AprU, IS76). 

 8 vols., Svo. Cloth, $3.50 per vol. Half Morocco, $6.50 per voL 



For Sale, Binding Cases for Vols. I, II., Ill, IV, V, VI., VII, and VIII., 



of The Popular Science Monthly. These covers are prepared expressly for binding 

 the volumes of The Popular Science Monthly as they appear, and will be sent to 

 Subscribers on receipt of price. Any binder can attach the covers at a trifling expense. 

 Price,- 50 cents each. 



Address D. AfPLETON &^ CO., Publishers, 



549 & 651 Broadway, New Tofk. 



^J) 



