This "Studies Series" is issued from time to time as contributio 

 are received. 



Educational , institutions, libraries, societies, and individuals de- 

 siring to be placed on the exchange list should make request to the 

 "Registrar of the University of Colorado, Boulder, Colo.," to whom 

 also should be addressed any correspondence in regard to purchase 5 

 of single copies. 



All exchanges should be addressed to the "Library of the Uni- 

 versity of Colorado, Boulder, Colo," 



Bhiding Note: Title-page and Contents of Volume XI are included with this number. 



