SCIENCE 



New 8EKi»a Frthav MarpttQ'? IQIfi Single Copies, 15 Ore. 



Vol. XLVU NO. 1212 TEIDAY, MARCH ZZ, iy 10 aknoal SuBsoEipnoN, ».()• 



Bausch & Lomb 

 Balopticons 



predominate in the colleges of the country 

 because Bausch & Lomb qualify is an unvary- 

 ing quantity. 



The college that uses Bausch & Lomb appara- 

 tus makes mention of that fact as an asset. 



The Balopticon has reduced optical projection to its 

 simplest terms. " Write today for our complete 

 catalog, describing and illustrating all models." 



Bausch ^\pmb Optical Q. 



552 ST. PAUL STREET ROCHESTER, f<LY. 



New York WashinsTton Chlcaeo San Francisco 



Leading American Makers of Microscopes, Photomicrographic and Projection Apparatus 



(Balopticons), Photographic and Ophthalmic Lenses, Stereo-Prism Binoctdars 



and other High Grade Optical Products. 



