HE ACADEMY OF 1NATURAL SdCIENCES 
of Philadelphia 
R. A. F. PENROSE, JR., 
president. 
EDWIN G. CONKLIN, 
HENRY SKINNER, 
Vice-Presidents. 
JAMES A. G. REHN, 
RECORDING SECRETARY. 
J. PERCY MOORE, 
Corresponding Secretary. 
GEORGE VAUX, JR. 
Treasurer. 
WITMER STONE, 
HENRY A. PILSSRY, 
GEORGE L. HARRISON, JR. 
T. CHALKLEY PALMER, 
Curators. 
SPENCER TROTTER, 
Librarian. 
Logan Square, 
PHILADELPHIA PA 
