Our Microscopes, Microtomes, Laboratory Glass- 

 ware, Chemical Apparatus, Chemicals, Photo I 

 Lenses and Shutters, Field Glasses, Projection I 

 Apparatus, Photo-Micro Cameras are used by 

 the leading Lab- _-H^_—^_ oratories and 

 Gover'nt Dep'ts|^HE»i Bound the World 



MOPES 



Catalog* 



Frea 



Bausch & Lomb Opt. Co. 



^ Rochester, N. Y. « 



New York Chicago Boston Frankfurt, G'yJ 



Photo Lenses! 



and Shutters of every 



kind for all purposes ; 



Professional. 



Amateur, Process. 



Sold Round the World on all 

 Cameras. Catalogue free. 



I Bausch & Lomb Opt. Co.^ 



ROCHESTER. N. T. 



New York Chicago Boston 



" WItli its head in the clouds." 



PIKES PEAK. 



One of the most famous mountains 

 in America stands about midway be- 

 tween Denver and Pueblo. Forty 

 years ago, it took as many days to 

 reach it as it now takes hours, so im- 

 proved are the transportation facili- 

 ties. The 



NEW YORK CENTRAL LINES 



and their connections offer fast and 

 luxurious trains with only one change 

 between New York or Boston and 

 important points in Colorado. 



A copy of " America's Winter Resorts," 

 will be sent free, on receipt of a two cent 

 stamp by George H. Daniels, General Pas- 

 senger Agent, New York Central & Hudson 

 River Railroad, Grand Central Station, 

 New York. 



One Hundred 

 Dollars 



will be paid for the best design 

 of the Densmote as the official 

 Typewriter of the St. Louis 

 World's Fair. Design to be 

 used for half page advertise- 

 ment in magazines, etc. 

 Award for this design to be 

 made February J, J904. 



FACsimite tetter from World's Fair 

 adopting the Densmore, together 

 'tvith catalogue, etc., sent on request. 



DENSMORE TYPEWRITER CO. 



309 Broadway, New York 



I RADIUM 



The New Radio-Active Element 



We are the sole agents for the New Spinthariscope, re- 

 cently invented by P'- William Crookes for showing the 

 marvelous radio-active properties of radium; also the 

 spinthariscope elides arranged for viewing these phe- 

 nomena with any microscope. Each instrument is 

 complete with particle of radium and flourescent 

 screen for viewin i tJie scintillations. 



^ The Splntlinrlscope, poxtpatd, - - $9.00 

 " The Spinthariscope Slide, postpaid. 7.60 



Duty free prices to schools and oolleges. Send for circu- 

 lar ; also catalogues of microscopes, stereopticons and slidei. 

 Agents for E. Leitz and K. & J. Beck Microscopes. 

 Williams, Brown &Earle,Dept. N. 918 Chestnut St., Philadelphia. 



^ PSYCHOLOGICAL ^ 



^ APPARATUS ^ 



A list of psychological apparatus supplied 

 to the laboratories of Columbia, Harvard 

 and other leading universities will be sent 

 on application. 



Special apjiaratus and instruments for psy- 

 chological and physiological research will be 

 made to order. Designs will be submitted 

 for original apparatus. 



E. HORSTMANN, 



546 West 125th St., NEW YORK CITY 



