ATTENTION has been directed in earlier communications [Hilditch and Jones, 1928; Hilditch, 1928] to the presence of A6: 7-octadecenoic acid or petroselinic acid in the fatty oil of parsley and other seeds of the Umbelliferae. It was shown in the preceding paper of this series that the seed fats of two native wild species of the order, Heracleum Sphondylium and Angelica sylvestris, contain in each case about 20 % of this isomeric oleic acid, together with 44-50 % of oleic, 25-33 % linoleic and about 4 % of palmitic acid. Seven other instances of Umbellate seed fats, drawn from common cultivated varieties, have now been examined and petroselinic acid has been found to be present in considerable amount in each case, the proportion varying from 26-60 % of the total mixed fatty acids.
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Christian et al. (1929) studied this question.