Guido Ferrari 
MAKER OF FINE GRADE 
> Drawing 
Optical and 
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Instruments 
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Experimental Work 
Models for Patent Office, Etc 
DRAWING INSTRUMENTS A SPECIALTY 
No. 911 VINE STREET, PHILA., PA., U. S. A 
Send for Price List—Mention American Naturalist 
OF INTEREST TO ALL STUDENTS AND LOVERS OF NATURE 
THE OBSERVER 
DEVOTED TO 
All Departments of Nature Studies. 
OUR MOTTO: 
“Keep Your Eyes Open 
(To observe the wonders and beauties of Nature.) 
or” Official Organ of the Agassiz Association, 
Consists of Three Departments 
2. Agassiz Association. 
1. The Outdoor World. 
3. Practical Microscopy 
E. F. BIGELOW, Managing Editor and Publisher, Portland, Conn 
