^ 





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, 

 John H. Schaffner, 

 C. J. Herrick, 



Trustees^ 



