



Produced by Chris Curnow, Iris Gehring and the Online
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  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