BULLETIN 
OF THE 
PHILOSOPHICAL SOCIETY 
or 
WASHINGTON. 
VOLE 
Containing the Minutes of the Society for the year 1883, and the 
Minutes of the Mathematical Section from its organiza- 
tion, March 2gth, to the close of the year. 
PUBLISHED BY THE CO-OPERATION OF THE SMITHSONIAN INSTITUTION. 
WASHINGTON: 
1884. 
