> UF 
NOTE. : 
The study upon which this paper is based was carried on 
under two grants of thirty-five and seventy-five dollars 
each from the Emerson McMillin Research Fund, and the 
expense of publication is met by the further aid of the 
same fund. 
WILLIAM R. LazENByY. 
F, M. WEBSTER, 
Joun H. ScHAFFNER, 
Trustees. 
