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THE POPULAR SCIENCE MONTHLY 



We find that phenomena similar to that described by you are not unknown 

 and have been discussed in numerous papers. One of the best of these is the 

 article on the Decorah Ice Cave and its explanation by Mr. Alois F. Kovarik, 

 Scientific American Supplement, November 26, 1898, pp. 19158 and 19159. 

 Dr. Samuel Calvin in his geology of Winneshiek County, Iowa (Iowa Geological 



A View of the Inside of the Mine, showing Ice-covehed Steps at the eight. 



Survey, Vol. 16, 1905, pp. 142 to 146), describes this phenomenon and quotes 

 at length from Mr. Kovarik 's article, with approval. See also ' ' Glaciers and 

 Freezing Caverns," by Edwin Swift Balch, Philadelphia, 1900, pp. 88, 89, 177, 

 136 to 161; also "Ice Caves and Frozen Wells as Meteorological Phenomena," 

 by H. H. Kimball, Monthly Weather Eeview, Vol. 29, pp. 366 and 509, 1901. 



The writer looked through these references hastily and from Balch's 

 "Glacieies or Freezing Caverns" the following is taken: 



The natives and peasants in the neighborhood of Glaciere caves generally 

 believe that the ice of caves is formed in summer and melts in winter. I have 

 met with this belief everywhere in Europe; in the Eifel, Jura, Swiss Alps, 



