icrosGopes 



50 Styles to Select From 



Journal of Applied Microscopy $1.00 Per 

 Year 



Laboratory Apparatus 



For Alt 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 



■ New York Rochester, N. Y. Chicago 



'The groves were God's first temples. 



SEPTEMBER 

 IN THE 

 ADIRONDACKS. 



No finer place in September can be 

 found than the Adirondacks. The air 

 is cool and bracing, the fishing fine, 

 the scenery beautiful, and they can be 

 reached in a night from Boston, New 

 York or Niagara Falls All parts of 

 the Adirondacks are reached by the 



New York Central Lines* 



A copy of No. 20 of the " Four-Track 

 .Series," "The Adiroudacks and How to 

 Keach Them," will be sent free on receipt of 

 a 2-t;cnt stamp by (ieurge U. Daniels, Gen- 

 eral I'assengcr Agent, New York Central 

 II. R., Grand Central Station, New York. 



The New Radio-Active Element 



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

 cently invented by Sir William Crookes for 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 SpintharlHCope, postpaid, - - 99.00 

 " The Spiiitiiarlecope Slide, postpaid, ?.50 

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

 lar ; also catalogues of microscopes, Btereopticons and sUdes. 

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

 Willlanis,Bro«n&Earle.Dept. K. 918 Chestnat St.,PhlUdelphlk. 



^ PSYCHOLOGICAL ^ 



^ APPARATUS ^ 



A list of psychological apparatus 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 for the solution of 

 special problems. 



E. HORSTMANN, 



546 West J 25th St., NEW YORK CITY 





