f APn I 



SCIENCE 



New SBBIE3 

 ToiA LI, No. 1320 



Friday, April 16, 1920 



Single Copies, 15 Cts. 

 AHNCAIj Subscbiftion, tC.W 



The First 

 Impression 



AMONG the first things young tongues say is " See ! See ! " Because it is 

 through the sense of sight that the first ray of conception filters to the 

 new brain. 



So too with growing intelligences of all ages. And there you have the very 

 reason why the 



(ausch'^'lomb 



BALOPTICON 



THE PERFECT STEREOPTICON 



is so necessary in classroom, laboratory and auditorium. Models are made for 

 showing either lantern slides or opaque objects (photo prints, specimens, post- 

 cards, etc.) or both. 



The Balopticon is the rojal road to a quicker understanding, the 

 first aid to a sluggish mind, the help thru which things are remem- 

 bered. The name of the maker assures the quality and length of 

 the Balopticon's service. 



BAUSCH & LOME OPTICAL CO. 



New York Washington San Francisco 



Chicago ROCHESTER, N. Y. London 



552 St. Paul Street 



Leading Avurican Makers of Photographic Lenses, Microscopes^ Projection AP' 

 paratus {Baiopticons')^ Ophthalmic Lenses and Instruments, Phot oiiiicrographic Ap- 

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

 jectors, Stereo-Prls7n Binoculars^ Magnz/iers and other High-Grade Opticas 

 Products. 



