1. The cedrene formula (III,cf. also XVIII) was proposed byA. Eschenmoser in his Ph.-D. Thesis, E.T.H., Zurich, 1952. Its correctness was demonstrated experimentally byPlattner et al. Cf. the paper byPl. A. Plattner, XIIIth Internat. Congress of Pure and Applied Chemistry, Stockholm, 29th July, 1953.
2. Sorm was the first to propose a many-membered ring structure for a terpenic compound. The elucidation of the structural details of the caryophyllenes was completed byBarton, Clemo, Dawson, andRamage.
3. Erratum: In the formulae of the C9 acids H and CH3 should be interchanged and 1 should read d.
4. The second representative is cycloartenol (Spring; Barton).
5. T. G. Halsall andE. R. H. Jones in a paper presented at the XIIIth Intern. Congress of Pure and Applied Chemistry, Stockholm, 29th July, 1953, also proposed formula VIII for polyporenic acidA.