Abstract
THERE are several notices in existence on the subject of the columnar structure of ice, to which attention has been called by Mr. La Touche (NATURE, May 9, p. 35). For instance, a letter by myself in the first volume of NATURE (p. 481), which contains references to sundry cases of the occurrence of the structure in Britain and in other parts of Europe, and offers a suggestion as to the cause. The structure may often be seen, if looked for, and is be t exhibited when a very gradual thaw follows a hard frost.
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