SCIENCE 





New Series 

 Vol. LII, Mo. 1351 



Friday, November 19, 1920 



SiNGLF- '^- ?, 15 CTS. 



ANi '^^ miPTiON, 86.00 

 ■ 5,(3 - 



What Can't Be Seen 

 Can't Be Imagined 



pjVEN the most fantastic things your mind can picture must resemble ob- 

 jects — or combinations of them — your eyes have beheld. The most 

 imaginative pupils become the most advanced when imagination is developed 

 and trained by accurate observation of things that are. From a knowledge 

 of these come the things to be. 



BAUSCH & LOME 



MICROSCOPES 



bring to youthful visions the minute objects otherwise invisible and stir the 

 imaginative instinct wherein lies progress. Don't ask your scholars to try 

 to imagine — for instance — the molecular structure of a bit of steel. Let them 

 see it through the lenses of a Bausch 6c Lomb Microscope. 



Bausch ^ Ipmb Optical (5. 



409 ST. PAUL STREET ROCHESTER, N.^. 



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 



'hat ^es may see '--'-=^^^ ^ 

 g-c better anl farther ^^^^^^^ 



