Crystal Multiplication without Nucleation

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Science  25 Jun 1965:
Vol. 148, Issue 3678, pp. 1717-1718
DOI: 10.1126/science.148.3678.1717


Disk-shaped ice crystals grow out from the surface of polycrystalline ice in undercooled water. The rupture of the neck of the attached disk is a means of multiplying the number of viable crystals in the surrounding undercooled water. This is a source of frazil ice in streams and a source of new crystals in metal castings which are grain-refined by stirring.