THE RAPIDLY INCREASING POPULARITY OF 



SPENCER 

 MICROSCOPES 



Is but the natural 

 result of 



f OPTICAL SUPERIORITY 

 MECHANICAL 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 New No. 36 H. 



Bucket Engtaving Co, 



Process and Wood Engraving, Electro- 

 typers and Manufacturers of Stereotyping 

 and Engraving Machinery. X X ^ \ X 



80^2 North High Street, 



COLUMBUS, OHIO, 



DIE STAMPING. 



PLATE AND LETTER PRESS PRINTING. 



SPAH% & GLENN, 



PRINTERS AND PUBLISHERS. 



50 EAST BROAD STREET. 



COLUMBUS, OHIO. 



When writing to advertiBera, please mention the " Ohio Naturalist." 



