Abstract
IN NATURE of December 21, 1940, p. 807, Mr. Fordham has referred to the shape of the particles of zinc oxide smoke, formed by burning zinc in air, as inferred from both optical and electron diffraction data. The accompanying photograph, obtained in this Laboratory by means of the electron microscope1, confirms his statement that some of the particles are in the form of needles. The photograph shows that the small crystals of which the smoke consists are about 4,500 A. in length and not more than 450 A. in thickness. There is a remarkable uniformity in the apparent length of the crystals, although there is no reason to suppose that they all lie in one plane.
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