Guido Ferrari 
Drawing 
Optical and 
Mathematical 
Instruments 
= need = 
G “ge | PHEA. 3 
Experimental Wor 
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. 
FHE OD S ERVE R 
All Departments of Nature Studies. 
OUR MOTTO: 
‘ Keep Your Eyes Open” 
(To observe the wonders and beauties of Nature.) 
@ Official Organ of the Agassiz Association. 
Consists of Three Departments: 
i. The Outdoor World. 2. Agassiz Association. 
3. Practical Microscopy. 
E. F. BIGELOW, Managing Editor and Publisher, Portland, Conn. 
