■■::r:Pao innJi:^. 



SCIENCfir 



Kbit Sbbies 

 Teii LI, No. 1312 



Fkidat, February 20, 1920 f""^^' ^°"^' ^^ ^^'- ..„. 



' ' Annual SOBSCBiPTiojf, $6.00 



Every Real Improvement 



Think of every reinement, every optical improvement 

 that can possibly go into the microscope — and you 

 will find these advantages present in the 



Model FS2, with two objectives in 

 reTolving nosepiece — $64.00 



|V|icroscopes 



The Accepted Standard 



Simply because Bausch & Lomb have built microscopes for 

 nearly fifty years and have in that time followed every possible 

 line of development, research and experiment that could im- 

 prove the quality of the service given by their product. 



There is a Bausch & Lomb model for every 

 microscopical requirement. Ask for our new 

 catalog. 



BAUSCH & LOMB OPTICAL CO. 



New York Washington San Francisco 



Chicago ROCHESTER, N. Y. London 



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

 paratus {Baiopticons)^ Ophthalmic Lenses and Instruments, Photovdcrographic Ap- 

 paratus, Range Finders and Gun Sights for Army and Navy, Searchlight Re- 

 flectors , Stereo-Prison Binoculars^ Magnifiers and other High-Grade Opticac 

 Products. 



