Produced by Chris Curnow, Iris Gehring and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) University of Texas Bulletin No. 1821: April 10, 1918 _Fossil Ice Crystals_ _An Instance of the Practical Value of "Pure Science"_ [Illustration: university emblem] 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 Publications of the University of Texas Publications Committee: F. W. GRAFF J. M. BRYANT D. B. CASTEEL FREDERIC DUNCALF R. H. GRIFFITH J. L. HENDERSON I. P. HILDEBRAND E. J. MATHEWS The University publishes bulletins six times a month, so numbered that the first two digits of the number show the year of issue; the last two the position in the yearly series. (For example, No. 1701 is the first bulletin of the year 1917.) These comprise the official publications of the University, publications on humanistic and scientific subjects, bulletins prepared by the Department of Extension and by the Bureau of Municipal Research and Reference, and other bulletins of general educational interest. With the exception of special numbers, any bulletin will be sent to a citizen of Texas free on request. All communications about University publications should be addressed to the Chairman of the Publications Committee, University of Texas, Austin. University of Texas Bulletin No. 1821: April 10, 1918 _Fossil Ice Crystals_ _An Instance of the Practical Value of "Pure Science"_ [Illustration: university emblem] 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 The benefits of education and of useful knowledge, generally diffused through a community, are essential to the preservation of a free government. Sam Houston Cultivated mind is the guardian genius of democracy.... It is the only dictator that freemen acknowledge and the only security that freemen desire. Mirabeau B. Lamar FOSSIL ICE CRYSTALS BY J. A. UDDEN AN INSTANCE OF THE PRACTICAL VALUE OF "PURE SCIENCE"