SCIENCE 



I Muss\>^ 



New Series 



Vol. LIV, No. 1385 



Friday, July 15, 1921 



Single Copies, 15 Crs. 

 Annual Subsckiption, $6.00 



New 



Stereoscopic 



Eyepiece 



PRICE, -with Pair of Matched 

 Eyepieces, Eyepiece Diaphragms 

 and Adapter for FFS Micro- 

 scope .. $50.00 



A MOST significant addition to our microscopical line, 

 for both laboratory and research workers; has been 

 enthusiastically received by those who have already seen 

 it demonstrated. Presents following advantages: 



1. Makes available the benefits of binocular 



vision at moderate cost; 



2. Can be adapted to almost any monocular 



microscope ; 



3. Gives stereoscopic effect ; 



4. Parallel position of eyepiece tubes, adjustable 



for interpupillary distance, allows full relax- 

 ation of ocular muscles, with consequent 

 relief from eye fatigue. 



Allowing the natural use of both eyes, this apparatus 

 will be particularly appreciated by all those who are 

 obliged to do frequent or extended work with the micro- 

 scope. 



Write for illustrated, descriptive circular 



Bausch ^ Ipmb Optical @. 



409 St, Paul Street ROCHESTER, N. Y. 



New York Chicago Washington San Francisco London 



Leading American Makers of Photographic Lenses, Microscopes, Projection Ap- 

 paratus { Balopticons) , Ophthalmic Lenses and Instruments, Phototnicro- 

 graphic Apparatus, Range finders and Gun Sights for Army and 

 Savn, Searchlight Reflectors, Stereo-Prism Binoculars, 

 Magnifiers and other high-grade Optical Products 



