THE POPULAR SCIENCE MONTHLY. 
conpuctep BY 
EB. L. YOUMANS. 
This periodical was started (in 1872) to promote the diffusion of valuable sci- 
entific k ledge, in a readable and attractive form, among all classes 
of the community, and has 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 different 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 savdnts of the highest au- 
thority. Prominent attention has been also devoted to those various sciences which 
help toa better understanding of the nature of man, to the bearings of science upon 
the questions of society and government, to scientific education, and to the conflicts 
which spring from the progressive nature of scientific knowledge. 
Tur Popunar Screnoz Monraty 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 bas 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. Bat no pains will be spared to 
improve it and make it still more worthy of liberal support, and still more a necessity 
to the cultivated classes of the country. 
Tue Porutar Scrence MonTuty is published in a large octavo, handsomely printed 
on clear type, and, when the subjects admit, fuily illustrated. Each number contains 
28 pages. 
~~ Terms: $5 per Annum, or Fifty Cents per Number, 
Postuge free to all Subscribers in tre United States, from January 1, 1875. 
A new volume of Ta Porutar Science Montuty begins with the numbers for 
May and November each year, Subscriptions may commence from any date. Back 
numbers supplied. 
Now Ready, Vols. I., II., HI., IV., V., VI. VIL, VII. and IX., of the Pt 
lar Science Monthly, embracing the numbers from 1 to 54 (May, 1872, to October, 
1876). 9 vols., 8yo, “ Cloth, $8.50 per vol. Half Morocco, $6.50 per vol. 
For Sale, Binding Cases for Vols. I., II., IlI.. IV., V, Vi. VIL, VIII. and 
IX, of The Popular Science Monthly, These covers are prepared expressly for 
binding the volumes of Tur Poputar Scrence MonTaucy 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. 
Appruss D. APPLETON & Co., Publishers, 
649 & 551 Brosdway, New York. 
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