SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 76. NUMBER 1 



SOME PRACTICAL ASPECTS OF 

 EUEL ECONOMY 



BY 

 CARL W. MITMAN 

 Divisions of Mineral and Mechanical Tectinology, United States National Museum 



(Publication 2715) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



JUNE 2, 1923 



