ADVERTISEMENTS. 
For Sale 
A Complete Set of 
The American Nat- 
uralist—BOUND. 
The Edwards & Docker C0. 
518 Minor St., 
PHILADELPHIA. 
OF INTEREST TO ALL STUDENTS AND LOVERS OF NATURE. 
FHE 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: 
4. The Outdoor World. 2. Agassiz Association. 
Practical Microscopy. 
E. F. BIGELOW, Managing Editor and Publisher, Portland, Conn. 
