SCIENCE 



Kew Series 



Vol. LIU, No. 1364 



Friday, February 18, 1921 



Single Copies, 15 -Cra ' 

 Annual bUBSCEiPTiON, S6.00 



,5 90^"- 



A Binocular Microscope 

 for Research Work 



Microscope CA£8 

 Price, $270.00 



MICROSCOPE CAl (ocular type, 

 using Single Objecti .= the full I range 

 of powers, is a most useful .| lent for pro- 

 longed observation. It is used witfi great sat- 

 isfaction by leading research workers. The 

 following advantages are offered : 



As the eyepiece tubes are mounted in a parallel 

 position, both eyes are used in the proper pos- 

 ture, eliminating eyestrain. 



The user is given the impression of increased 

 penetrating power, permitting him better to in- 

 terpret what is seen. 



It yields brilliancy of field and improved quality 

 of image. 



Provides maximum range for adjustment for in- 

 terpupillary distance; left eyepiece is adjustable. 

 As the right eyepiece is rigid and vertical, the 

 Camera Lucida may be used if desired. 



Write for literature or information on this, or other 

 Bausch & Lomb Microscopes 



Bausch ^ Ipmb Optical Q. 



Ne-w York 



ROCHESTER, N. Y. 



San Francisco 



London, 



409 St. Paul Street 



Chicago Washingtoit 



Leading American Makers of Photographic Lenses, Microscopes, Projection-Apparatus (Balopticons) 



Ophthalmic-Lenses and Instruments, Photomicrographic Apparatus, Range Finders and Gun 



Sights for Army and Navy, Searchlight Reflectors, Stereo-Prism Binoculars, 



Magnifiers, and other high-grade Optical Products 



