ADVERTISEMENTS. i 
For Sale 
A Ter Set of 
The American Nat- 
uralist—BOUND. 
The Edwards & Docker G0. 
518 Minor St., 
PHILADELPHIA. 
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.) 
oo 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. 
