MAGAZINES AND REVIEWS! ! 



Complete sets of all the leading Magazines and Reviews and 

 back numbers of several thousand periodicals, for sale at low 

 rates. Full files of Science^ either bound or unbound, or odd 

 volumes and numbers supplied. Subscriptions taken on favorable 

 terms for any periodical either American or foreign. Address 

 THE AMERICAN AND FOREIGN MAGAZINE DEPOT, 

 47 Dey street, New York City. 



PHOTO -MICROGRAPHY. 



GAYTON A. DOUGLASS & CO. 



Merchants in all supplies pertaining to 

 Photography. 



Catalogues furnished on application. 

 Correspondence solicited. 



185 & 187 Wabash Ave., Chicago. 



SAMUEL HENSON, 



Mineralogist and Geologist, 



invites visitors to London to inspect his choice speci- 

 mens of Minerals, Gems, and Polished Stones. 

 Catalogue on application. 



SAMUEL HENSON, 277 Strand, London, 



v OPPOSITE NORFOLK STREET. 



QUSTAV E. STECHERT, 



766 Broadway, New York. 



Importer of Scientific Books and Periodicals. 

 Branches : Leipzig, Hospital Str. 16 ; London, 26 

 King William Str., Strand. 



SCIENTIFIC LIBRARY FOR SALE. 



One of the largest and most complete libraries in the west, in 

 the departments of Geology and Palaeontology, embracing over 

 1250 catalogued numbers, and numerous maps and pamphlets, is 

 for sale. Address A. H. WORTHEN, Springfield, Ills. 



I 



"THE ELECTRICAL REVIEW," 



An illustrated w eekly j ournal, is the ac know ledgcd lead- 

 er in the world of electrical science. Edited with care, 

 its editorial opinion is reliable, its news columns bright 

 and instructive. $3.00 per year; single copies, 10 cents. 

 23 PARK ROW, NEW YORK. 

 " Best advertising medium in the electrical field. 



j THE CHEAPEST AND BEST ! 



% 6? PARK PMEE.NEW YORK" 



ENGRAVING FDR ALL ILLUSTRATIVE AND 

 * * • ADVERTISING PURPOSES • 



BOUND VOLUMES OF "SCIENCE." 



The publisher would be pleased to communicate at once with all persons who desire 

 full sets of the volumes (six) of SCIENCE. Address 



" Publisher of Science," 743 Broadway, New York. 



"It is not too much to say of the 

 Nation that no single agency has 

 done so much to advance and dig- 

 nify the calling of journalism in 

 America." — Chicago Dial. 



"Its success has been almost 

 contemporaneous with the rise of 

 a new school of thinkers on pub- 

 lic questions in this country." — 

 Christian Union. 



" That the Nation was the fore- 

 runner and the first successful ex- 

 ample of the independent journal- 

 ism as it exists to-day may be 

 asserted without fear of success- 

 ful contradiction." — Philadelphia 

 Times. 



" Many changes have occurred 

 since the Nation first appeared as 

 an independent political and liter- 

 ary journal, not the least impor- 

 tant being the improvement effect- 

 ed by its precept and example in 

 political and literary criticism 

 across the Atlantic." — London 

 Athenaeum. 



"TRIAL SUBSCRIPTION" BLANK. 



Publisher of "The Nation" 



P. O. Box 794, New York. 



For enclosed 25 cents send " The Nation" two 

 months to the address below. 



Name, : 



Town, 



State, 



On receipt of the above with 25 cents The Nation will be sent to new 

 readers for two months (half-rate). 



