NOTE. 



The investigations upon which this paper is based were 

 made under two grants of fifty dollars each from the Emerson 

 McMillin Research Fund, and the results are now published by 

 the further aid of the same fund. 



F. M. Webster, 

 H. C. Beardseee, 



WlUJAM R. IyAZENBY, 



Trustees. 



