Microscopes 



50 Styles to Select From 



Journal of Applied Microscopy $1.00 Per 

 Year 



Laboratory Apparatus 



For All Purposes 



Photographic Lenses 



For Ordinary and Microscopic Purposes 



Chemicals 



AND CHEMICAL APPABATUS 



Estimates for Import 



Large Stock Always On Hand 



Catalogue of All Lines Free 



Bausch & Lomb Optical Co., 



New York Rocbestor, N. T. 



Chicago 



" Of all inventions, the alphaljet and print- 

 ing press alone excepted, those inventions 

 which abridge distance have done most for 

 drilizatioxu" --Macaulay. 



MAP OF THE 

 NEW YORK 

 CENTRAL LINES. 



A system of 11,126 miles of railway 

 in the populous territory east of 

 Chicago, St. Louis and Cincinnati, 

 furnishing luxurious and rapid trans- 

 portation facilities for more than one- 

 half of the entire population of the 

 United States. 



Details of rates and trains given by 

 any New York Central ticket agent. 



A copy of " America's Winter Resorts," 

 will be sent free, postpaid, on receipt of a 

 postage stamp bv George 11. Paniels, Gen- 

 eral Passenger Agent. New York Central 

 & Hudson Iviver Kailroad, Grand Central 

 Station, New York. 



RADIUM 1 



The New Radio-Adive Element 



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

 cently invented by Sir William Crookesfor showing the 

 marvelous radio-active properties of radium; also the 

 spinthariscope slides arranged for viewing these phe- 

 nomena with any microscope. Each instrument is 

 complete with particle of radium and flourescent 

 screen for viewing the scintillations. 



The Spinthariscope, poxtpaid, • • $9,00 

 " Tlie Spinthariscope Slide, postpaid, 7.60 

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

 lar ; also catalogues of microscopes, stereopticons and slidei. 

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

 >VlIIiams,Browii&EarIe,Dept. N. 918Che8tnnt St.,Phll»delphl». 



J^ PSYCHOLOGICAL ^ 



^ APPARATUS ^ 



A list of psychological apparatus supplied 

 to the lahoratories 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 1 25th St., NEW YORK CITY 



Stop drinking Coffee ! !! 



Have Breakfast 

 with Me- 



YOUR GROCER 

 HAS IT. - 



IF YOU WANT 

 QUALITY." 



