The formation of ice crystals in cloud chambers generally takes place by the freezing of supercooled water drops rather than by the sublimation of vapour on to suitable nuclei. Fournier d'Albe found that particles of cadmium iodide possessed the unusual property of allowing ice crystals to grow on their surfaces by sublimation, under certain circumstances. Three other substances, CaCO 3 , CaSO 4 .2H 2 O and sodium bentonite clay have now been found to behave similarly. An explanation is suggested.
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S. C. Mossop (1956) studied this question.
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