Our Microscopes, Microtomes, Laboratory Glass- 

 ware, Chemical Apparatus, Chemicals, Photo 

 Lenses and Shutters, Field Glasses, Projection 

 Apparatus, Photo-Micro Cameras are used by 

 l^e leading Lab- _^^-i^i_ oratories and 

 Gover'nt Dep'ts|^^^^^S Round the World j 



Catalogt 



Pre* 



Bausch & Lomb Opt Co. 



, New York 



Rochester, N. Y. ~ •* 



Chicago Boston Frankfurt, G'y^ 



Photo Lenses! 



and Shutters ol every 



kind lor all purposes ; 



Professional, 



Amateur, Process. 



Sold Round the World on «I1 

 Cameras. Catalogue free. 



iBausch & Lomb Opt Co.^ 



ROCBESTER. N. ¥. 

 New York Chicago Boston 



UM 



For Esperimcntal and Medical Use. 



We supply radium of high activity and also the 

 Wew Spinthariscope, recently inveuted by Sir Wm. 

 Crooltea for stiowing the marvelous radio-active prop- 

 erties of radium; also the Spinthariscope slides ar- 

 ranged for viewing these phenomena with any micro- 

 scope. iSach Instrument is complete with particle of 

 radium of 300,000 activity and fluorescent screen. 

 No. RS. The complete Spinthariscope, postpaid, 99.00 

 No. Rl. The Spinthariscope Slldo, postpaid, »?.60 

 Duty free prices to schools and colleges. Send for circnlare 

 and catalogue of microscopes, stereopticons, and educa- 

 tional lantern slides, covering Geology, Geography, Bot- 

 any, History, Astronomy, etc. Agents for E. Leitz, Carl 

 Zeiss, and R. <fe J. Beck Microscopes. 



WILLIAMS. BROWN & EARLE, 

 Department N, 918 Oheatnut St., Philadelphia. 



^ PSYCHOLOGICAL ^ 



^ APPARATUS ^ 



A list of psychological apparratus supplied 

 to the laboratories of Columbia, Harvard 

 and other leading universities will be sent 

 on application. 



Special apparatus and instruments for psy- 

 chological and physiological research will be 

 made" to order. Designs will be submitted 

 for original apparatus. 



E. HORSTMANN, 



546 West J 25th St., NEW YORK CITY 



" Kisen from the ashes of a former desert." 



PHOENIX , 

 ARIZONA, 



Possesses wonderful attractions as a 

 winter resort. Its climat« is perfect 

 and it can be reached by the 



NEW YORK CENTRAL LINES 



And their connection."; in four and one- 

 half days fiom New York or Boston. 

 For particulars call on any ticket agent 

 of the New York Central or Boston & 

 Albany. 



Send a two "cent stamp for No. 5" of the 

 " Four-Track Series " to George H. Daniels. 

 General Passenger Agent, New York Central 

 & Hudson River Kailroad, Grand Central 

 Station, New York. 



The Ball Bearing 



DENSMORE 



Can save yo« time, work and 

 money. Let us show yo« the im- 

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 MORE DOES MORE than any 

 other typewriter. 



Catalogue for the Askiug 



DENSAIORE TYPEWRITER CO. 



309 Broadway, New York 



