vidi ADVERTISEMENTS. 
Guido Ferrari > 
MAKER OF FINE GRADE 
Drawing 
| Optical and 
Mathematical 
Instruments 
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 
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: 
1. The Outdoor World. 2. Agassiz Association. 
Practical Microscopy. 
E. F. BIGELOW, Managing Editor and Publisher, Portland, Conn. 
