NOTE. 
The expense of publication of this monograph is covered by 
a special grant from the Emerson McMillin Research Fund and 
a small grant was previously made to assist in meeting the ex- 
pense incurred during the progress of the investigation on which 
the paper is based. 
WILLIAM R. LAZENBY, 
Joun H. ScHAFFNER, 
C. J. HERRICK, 
Trustees. 
