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CERTAIN preparations described in the preceding paper [Drummond et al., 1935] were examined by the method of surface films, with the object of obtaining information about their molecular structure. The substances examined included an oil concentrate rich in vitamin E, and the crystalline substance m.P. 1900 (from acetate M.P. 2360, from E-active fractions 3 and 4).
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F. A. Askew (1935) studied this question.
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