University of Texas Bulletin 



No. 1821: April 10, 1918 





Fossil Ice Crystals 



An Instance of the Practical Value of 

 ''Pure Science" 



Bureau of Economic Geology and Technology 



Division of Economic Geology 



J. A. Udden, Director of the Bureau and Head of the Division 



Published by the University six times a month and entered as 



second-class matter at the postoffice at 



AUSTIN, TEXAS 



