LABORATORY WORKERS APPRECIATE 
SPENCER MICROSCOPES 
BECAUSE 
I. They represent the best optics and 
stands of the latest types of design. 
II. They stand the rough and tumble of 
, laboratory use. 
III. There are incorporated in them more 
features of practical usability and 
features which make for conven- 
ience, comfort and durability. 
IV. They are designed and built under the 
direction of men who have had 
many years of practical laboratory 
experience as well as experience in 
manufacture, men who understand 
and are in sympathy with the needs 
of laboratory workers. 
SPENCER OPTICS 
HAVEJ5TOOD UNSURPASSED FOR 
OVER HALF A CENTURY 
SPENCER LENS COMPANY 
BUFFALO, N. Y. 
Bucket Engtaving Co. 
Process and Wood Engraving, Electro- 
typers and Manufacturers of Stereotyping 
and Engraving Machinery. 5» 5. 5. L 
30 1 / 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 advertisers, please mention the “ Ohio Naturalist." 
