GOOD RESULTS 



can only be obtained in Photo-Micrographic work 

 when perfectly accurate apparatus is used. The 



Queen Microscopes 



are intelligently designed and accurately made 

 and adjusted in every way. Objects specially 

 prepared for Photo-Micrography. 



CATALOGUES SENT ON APPLICATION 



BM Microscopes, Lenses, Photo-Micrographic Apparatus, etc. 

 HH Projection Microscope, Polariscope, etc. 



QUEEN & CO. 



Optical and Scientific Instrument Works 



1010 Chestnut Street, PHILADELPHIA 



50 Fifth Avenue, NEW YORK 



