UNIVERSITY OF COLORADO BULLETIN 



Vol. XV, No. 6 



Published Monthly by the Regents of the University of Colorado. 

 Entered at the Post O^ce, Boulder^ Colorado^ as second-class mail matter. 



THE 



UNIVERSITY OF COLORADO 



STUDIES 



Boulder, Colorado, June, 191 5 



General Series, No. 83 

 Studies Series, Vol. XI, No. 4 



