The expense of the i)ublication of this paper is covered by a 

 grant from the Emerson McMilHn Research Fund. 



William R. Lazenrv, 

 E. L. Rice, 

 Frank Carney, 



Trustees, 



Publication Coinuiittee: 



J. C. Hambleton, E. L. Rice, Bruce Fink. 



Date of pubHcation, June 15, 1911. 



353 



