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 New No. 36 H. 
Bucket Engtaving Co. 
Process and Wood Engraving, Electro- 
typers and Manufacturers of Stereotyping 
and Engraving Machinery. Jv \ & Jw Ik 
80% North High Street , COLUMBUS, OHIO, 
DEE^STAMPING. PLATE AND LETTER PRESS PRINTING, 
SPAH% & GLENN \ 
PRINTERS and PUBLISHERS. 
50 EAST ABROAD STREET. 
COLUMBUS, OHIO. 
When writing to advertisers, please mention the " Ohio Naturalist. 1 
