THE RAPIDLY INCREASING POPULARITY OF 



SPENCER 

 MICROSCOPES 



Is but the natural 

 result of 



OPTICAL SUPERIORITY 

 ECHANICAL PERFECTION 



and the embodiment of many 

 Improvements which mark 

 them as being adapted best of 

 all to their purpose. 



We Lead in these Improvements, 



Spencer=Lens Co., 



BUFFALO, N. Y. 

 Our Neir No. 36 H. 



Buchet Engtaving Co. 



Process and Wood Engraving, Electro- 

 typers and Manufacturers of Stereotyping 

 and Engraving Machinery. 5» S» 5; J; S» 



80}4 North High Street 



COLUMBUS, OHIO. 



DIE STAMPING. 



PLATE AND LETTER PRESS PRINTING. 



SPAHIi & GLENN, 



PRINTERS AND PUBLISHERS. 



50 EASTfBROAD STREET. 



COLUMBUS, OfflO. 



When writing to advertiaera, pleasa mention tho " Ohio Naturalist. " 



