Abstract
IN previous communications1,2, the occurrence of spiral pits on crystals of some substances has been described. The phenomenon has been attributed to the presence of screw dislocations in the crystal, and a detailed analysis of the growth mechanism based on this assumption has been given3,4. It has also been suggested that, when a spiral pit is present on the upper surface, the lower surface should exhibit a Frank spiral (spiral hill)5, at least when the dislocation line extends through the crystal plate4. It has now been possible to obtain strong evidence that this is indeed the case.
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