SCIENCE 



SEP 20 1920 



ioasi Mn'se^ 



New Series 

 Vol. Ln, No. 1342 



Friday, September 17, 1920 



Single Copies, 15 Cts. 

 Annual Subscription, $6.00 



The Shortest Path 

 to the Brain 



is through the eye. And impressions so receiveit^.--^ the more 

 indehbly stamped on the student's mind when they have been 

 many times enlarged and intensified through the use of a microscope. 



The best results are obtained by the use of 



BAUSCH & LOME 



MICROSCOPES 



which have been the accepted standard for nearly fifty years. 

 During that time Bausch & Lomb have followed every possible 

 line of development, research and experiment that could improve 

 the quality of the service given by their product. 



There is a Bausch & Lomb model for every micro- 

 scopical requirement. Write for our new catalog. 



BAUSCH & LOMB OPTICAL CO. 



409 ST. PAUL STREET 



ROCHESTER. N. Y. 



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 



