PROCEEDINGS 
OF THE 
AMERICAN PHILOSOPHICAL, SOCIETY 
FOR 
PROMOTING USEFUL KNOWLEDGE. 
Vol. XXI. 
MAY 1888 ro DECEMBER 1884. 
NOS. 114, 115, 116. 
PHILADELPHIA : 
PRINTED FOR THE SOCTH TY 
BY M’CALLA & STAVELY. 
“1884. 
