THE YOUNG OOLOGIST. 



Bausch & Lomb Optical Co., 



-MANUFACTURERS OF- 



MICROSCOPES, TELESCOPES, MAGNIFIERS, 



And Other Optical Instruments. 



ROCHESTER, N.Y. 



—533-539— 



North St. Paul Street. 



P. O. Box 354. 





lijiinii^ iii <^ 



EXCELSIOR POCKET AND DISSECTING MICROSCOPE. 



|^= Illustrated Catalogue Free on Application. 



Mention The Young Oologist. 



