Abstract
IN the course of recent experiments it was found, in agreement with French1, that suitable polishing destroys the crystalline structure of metallic surfaces. In addition, new and remarkable facts came to light. Thus, we have observed that when certain metal vapours are condensed on a substrate consisting of a polished metallic surface, crystals are formed which, however, rapidly disappear at room temperature. This is borne out by the fact that, whilst the freshly formed deposit gives rise to a characteristic electron-diffraction pattern, the rings more or less rapidly disappear, and that without any appreciable broadening effect. On the other hand, in the case of a crystalline but otherwise similar substrate, the diffraction pattern yielded by the deposit is permanent.
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