THE POPULAR SCIENCE MONTHLY. 
Conducted by E. L. YOUMANS. 
TMs perio<lical was started (in 1S7’2) to promote the diffusion of valuable 
scientific knowledge, in a readable and attractive form among 
all classes of the comniunity, and has thus far met a 
want supplied by no other magazine in 
the United States. 
Nine 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 scientific 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 authority. Prominent attention has been also de- 
voted 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 scientific education, and to 
the conflicts which spring from the progressive nature of scientific knowledge. 
The Popul.ar Science Monthly has long since ceased to he an experiment. It has passed into 
a circulation far beyond the most sanguine hopes at first entertained, and the cordial and intel- 
ligent 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 accomplished as giving it a claim upon popular patronage. But no pains 
will be spared to improve it, and make it still more worthy of liberal support, and stiU more a 
necessity to the cultivated classes of the country. 
The following quotations illustrate the way it has been habitually spoken of by the press : — 
“ That there is a place for The Popular Sci- 
ence Monthly, no one can doubt who has 
watched the steady increase of interest in sci- 
entific investigation manifested in this country, 
not only by a select class, but by the entire 
community.” — New York Times. 
“ We think it is not too much to say that this 
is the best first number of any magazine ever 
published in America.” — New York Wotld. 
“ A journal which promises to be of eminent 
value to the cause of popular education in this 
country.” — New York Tribune. 
“ It is, beyond comparison, the best attempt 
at journalism of the kind ever made in this 
country.” — Home Journal. 
“ It is just what is wanted by the curious and 
progressive mind of this country, and ought to 
be widely circulated.” — N. Y. Evening Post. 
“ It is the first successful attempt in this 
country to popularize science in the pages of a 
monthly.” — N. Y. School Journal. 
“ The Monthly has more than fulfilled all the 
promises which the publishers made in the pro- 
spectus of publication.” — Niagara Falls Ga- 
zette. 
“ This is a highly auspicious beginning of a 
useful and much needed enterprise in the way 
of publication, for which the public owe a spe- 
cial debt of obligation to Messrs. D. Appleton 
& Co.” — Boston Gazette. 
“ This new magazine, in our estimation, has 
more merit than the whole brood which have 
preceded it.” — Oswego Press. 
“In our opinion, the right idea has been 
happily hit in the plan of this new monthly.” 
— Buffalo Courier. 
“ This is one of the very best periodicals of 
its kind published in the world. Its corps of 
contributors comprise many of the ablest minds 
known to science and literature. It is doing a 
great and noble work in popularizing science, 
promoting the growth of reason, and levelling 
the battlements ofold superstitions reared in the 
childhood of our race before it was capable of 
reasoning.” — The American Medical Journal, 
St. Louis, Mo. 
“ This magazine is worth its weight in gold, 
for its service in educating the people.” — The 
American Journal of Education, St. Louis, 
Mo. 
The Popular Science Monthly is published in a large octavo, handsomely printed on clear type, 
and, when the subjects admit, fully illustrated. Each number contains 128 pages. 
Terms; $5.00 per Annum, or Fifty Cents per Number. 
POSTAGE FREE TO ALL SUBSCRIBERS IN THE UNITED STATES. 
A new volume of the Popular Science 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, VII, VIII, and IX, of The Popular Science 
Monthly, embracing the Numbers from 1 to 54 (May, 1872, to October, 1876). 9 vols. 8vo. 
Cloth, ^ 3.50 per vol. Half Morocco, $ 6.50 per vol. 
For Sale, Binding Cases for Vols. I, II, HI, IV, V, VI, VH, VHI, and IX, of The Popu- 
lar Science Monthly. These covers are prepared expressly for binding the volumes of The Pop- 
ular 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. 
AGENTS WANTED. 
Address 
D. APPLETON & CO, Publishers, 
549 & 551 Broadway, New York. 
