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New Series 

 Vol. LV, No. 142 



Friday, April 21, 1922 



Single Copies, 15 Cts. 

 Annual Stjbsckiption, $6.00 



The Student 



Becomes an Enthusiast 



when lie sees the minute objects and organ- 

 isms as revealed through a 



Bausch & Lomb 



The thought that he sees things at first hand 

 as the scientist sees them, is a remarkable 

 stimulant to his interest. 



Simple and well-built Bausch & Lomb Mi- 

 croscopes are made to fit every requirement 

 of the class room and laboratory. 



Write for booklets — consult us about your 

 microscope equipment. 



Bausch & Lomb Optical Go. 



409 St. Paul Street, Rochester, N. Y. 



New York Washington Chicago San Francisco London 



Leading American Makers ol Photographic Lenses, Micro op ■ Pra--cti n Ipparatus (Balopticoris) Ophthalmic Le 

 and Instruments, Photonticrographic Apparatus, Rang/ F nd and Oun i ^ fo 4 n y and Tiavy Sea c! I sht 



Reflectors, Stereo-Prism Binoculars, Magn fie s an I o I ^ ale Op al P oducts 



^ APR gr 1922 



