324 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (45) Dauben, W. G., and Hance, P. D., "The Position of the Double Bond in Pseudo- santonin," 7. atm. Chem. $oc., 75, 3352 (1953). (46) Dauben, W. G., and Hance, P. D., "The Structure off-Santonin," Ibid., 77, 606 (1955). (47) Dawson, T. L., Ramage, G. R., and Whitehead, R., "The Structure of Caryophyllene," Chemistry & Industry, 450 (1952). (48) Dawson, T. L., Ramag•, G. R., and Wilson, B., "The Structure of Caryophyllene," Ibid., 464 (1951). (49) Der, S., "Structure of Humulene," Current Sci. (India), 20, 296 (1951). (50) Djerassi, C., Rittel, W., Nussbaum, A. L., Donoran, F. W., and Herran, J., "The Constitution of Iresin. A New Fundamental Sesquiterpene Skeleton," •7. atm. Chem. Soc., 76, 6410 (1954). (51) Djerassi, C., Sengupta, P., Herran, J., and Walls, F., "The Isolation of Iresin, a New Sesquiterpene Lactone," Ibid., 76, 2966 (1954). (52) Dolej•, L., and •orm, F., "Synthesis of 2,8,8-Trimethylbicyclo-(5,2,0)nonane:a Proof of the Constitution of/•-Caryophyllene," Coll. Czech. Chem. Comm., 19, 559 (1954). (53) Eschenmoser, A., and Gunthard, H. H., "Zur Cyclisation des/•-Caryophyllens," Helv. Chim. atcta, 34, 2338 (1951). (54) Eschenmoser, A., and Schinz, H., "Zur Konstitution des Zingiberens," Ibid., :33, 171 (1950). (55) Eschenmoser, A., Schreiber, J., and Keller, W., "Zur Konstitution des Lanceols," Ibid., 34, 1667 (1951). (56) "Specifications and Standards," Essential Oil Association, Scientific Section, New York. (57) Fawcett, R. W., and Harris, J. O., "The Chemistry of Humulens. IV-V," •7. Chem. $oc., 2669, 2673 (1954). (58) Fawcett, R. W., and Harris, J. O., "The Structure of Humulene," Chemistry & Indus- try, 405 (1954). (59) Fawcett, R. W., and Harris, J. O., "Synthesis in the Humulene Series," Ibid., 18, 67 (1953). (60) Garcia de Nadal, N., "Chromatographic Separation of Terpenes, Sesquiterpenes, and Terpenoid Compounds," .4m. Perfumer Exxent. Oil Rev., 65, 17 (1955). (61) Geissman, T. A., "On the Structure of Eremophilone," 7. •lm. Chem. $oc., 75, 4008 (1953). (62) Glichitch, L. S., and Naves, Y. R., "Sur la Composition de l'essence d'ylang-ylang," Parfumx France, 10, 7, 41 (1932). (63) Gordon, M., "The Azulenes," Chem. Rev., 50, 127 (1952). (64) Guenther, E., "The Essential Oils," 6 vols., New York, D. Van Nostrand Co, Inc. (1948-1952). (65) Gunstone, F. D., and Heggie, R. M., "Experiments on the Synthesis of Santonin. I. The Preparation of the Lactone of a-(2-Hydroxy-3-Ketocydohexyl)propionic Acid," 7. Chem. $oc., 1354 (1952). (66) Gunstone, F. D., and Heggie, R. M., "Experiments on the Synthesis of Santonin. II. The Preparation of Compounds Containing the Dienone System Present in Santonin," Ibid., 1437 (1952). (67) Haagen-Smit, A. J., "Azulenes," in L. Zechmeister (Ed.), "Fortschritte der Chemie organischer Naturstoffe," Vol. V, Vienna, Springer-Verlag (1948), p. 40. (68) Haagen-Smit, A. J., "Sesquiterpenes and Direrpenes," in L. Zechmeister (Ed.), "Fort- schritte der Chemie organischer Naturstoffe," Vol. XII, Vienna, Springer-Verlag (1955). (69) Harris, C. M., and McKern, H. H. G., "A Note on the Occurrence of Guaiol in Some Essential Oils of Eucalyptus citriodora Hook.," in "Researches on Essential Oils of the Australian Flora" (Museum of Technology and Applied Science, Sydney), Vol. II (1950), p. 15. (70) Harris, J. O., "The Chemistry of Humulene. III," •7. Chem. $oc., 184 (1953). (71) Hellyer, R. O., and McKern, H. H. G., "The Essential Oil of Backhousia myrtifolia Hooker et Harvey. Single-tree Studies on Physiological Forms from Queensland," 7. Proc. Roy. Soc. New South Wales, 89 (1955). (72) Herout, V., Bene•ovfi, V., and Pliva, J., "The Sesquiterpenes of Ginger Oil," Coll. Czech. Chem. Comm., 18, 248 (1953). (In Russian.) (73) Herout, V., and Dimitrov, D. J., "Sesquiterpenic Hydrocarbons of Ylang-Ylang Oil," Chem. Listy, 46, 432 (1952). (74) Herout, V., Kolo•, T., and Pliva, J., "Sesquiterpenes of the Cadinene Type in Javanese Citronella," Ibid., 47, 440 (1953).

RECENT DEVELOPMENTS IN ESSENTIAL OILS 325 (95) (96) (97) (98) (99) (100) (101) (102) (103) (75) Herout, V., and •antav:•, F., "The Constitution of e- and •-Cadinene," Coll. Czech. Chem. Comm., 19, 118 (1954). (76) Herout, V., and •orm, F., "Pr[sp•vek ke konstituci pro-chamazulenogenu, pirozencho zdroje chamazulenu v Atrtemisia absinthium L.," Chem. Listy, 48, 706 (1954). (77) Herout, V., and •orm, F., "Contribution to the Constitution of Prochamazulenogen, the Natural Precursor of Chamazulene in Atrtemisia absinthium L.," Coll. Czech. Chem. Comm., 19, 792 (1954). (78) Herout, V., and •orm, F., "On the Components of Wormwood (•lrtemisia absinthium L.) and the Isolation of a Crystalline Pro-chamazulenogen," Ibid., 18, 854 (1953). (79) Herout, V., Streibl, M., Mleziva, J., and •orm, F., "On the Identity of Humulene and 'a-Caryophyllene'," Ibid., 14, 716 (1949). (80) Indian Standards Institution, Delhi, India, Essential Oil Sectional Committee. (81) International Organization for Standardization. Findings not yet published. (82) James, A. T., "Separation of Volatile Materials by Gas-liquid Chromatography," MJg. Chemist, 26, 5 (1955). "New Technique for the Separation of Volatile Materials," Research (London), 8, 8 (1955). (83) Johnston, V. D., "Aidehyde Determination by Oximation," Drug & Cosmetic Ind., 75, 179 (1954). (84) Kirchner, J. G., and Miller, J. M., "Preparation of Terpeneless Essential Oils. A Chromatographic Process," Ind. Eng. Chem., 44, 318 (1952). (85) Klyne, W., "The Molecular Rotations of Polycyclic Compounds. I. General Prin- ciples and Correlations of the Triterpenoids with the Steroids," ]. Chem. Soc., 2916 (1952). (86) Klyne, W., "The Molecular Rotations of Polycyclic Compounds. II. Diterpenoids and Sesquiterpenoids," Ibid., 3072 (1953). (87) La Face, F., Stazione Sperimentale per l'Industria delle Essenze e dei Derivati Agrumari, Reggio Calabria, Italy. Private Communication. (88) Lutz, A. W., and Reid, E. B., "Clovene and/%Caryophyllene Alcohol," ]. Chem. Soc., 2265 (1954). (89) Lutz, A. W., and Reid, E. B., "On the Nature of/%Caryophyllene Alcohol, Clovene and Clovenic Acid," Chemistry & Industry, 278 (1953). (90) Lutz, A. W., and Reid, E. B., "On the Relationship between/%Caryophyllene Alcohol and Clovene," Ibid., 749 (1953). (91) Matsui, M., Kitamura, S., Suzuki, Y., and Hamuro, M., "Experiments on the Synthesis of Santonin. I. Preparation of 2-Keto-l-10-dimethyldecalin," Bull. Chem. Soc. •apan, 27, 5 (1954). (92) Matsui, M., Toki, K., Kitamura, S., Suzuki, Y., and Hamuro, M., "Experiments on the Synthesis of Santonin. II. Preparation of a Stereoisomeride of Santonin," Ibid., 27, 7 (1954). (93) McKern, H. H. G., and Spies, M. C., "A Note on the Composition of the Essential Oil of Eucalyptus citriodora Hook., Type," ]. Proc. Roy. Soc. New South It•ales, 87, 24 (1953). (94) McKern, H. H. G., Spies, M. C., and Willis, J. L., "Critical Studies on Variations in Essential Oil Yield and Composition Within and Between Individual Trees of Various Eucalyptus Species," in "Researches on Essential Oils of the Australian Flora" (Museum of Technology and Applied Science, Sydney), Vol. III (1953), p. 7. McKern, H. H. G., Spies, M. C., and Willis, J. L., "The Essential Oil of Eucalyptus maculata Hooker," ]. Proc. Roy. Soc. New South I4•ales, 88, 15 (1954). McQuillin, F. J., "The Structure of Cyperone. Natural and Synthetic Cyperones," •. Chem. Soc., 528 (1955). McQuillin, F. J., "Structure of/%Cyperone," Ibid., 716 (1951). Meisels, A., and Weizmann, A., "The Structure of Chamazulene," •. •lm. Chem. Soc., 75, 3865 (1953). Menon, K. N., "Longifolene," Current Sci. (India), 23, 266 (1954). Miller, J. M., and Kirchner, J. G., "Chromatostrips for Identifying Constituents of Essential Oils," •lnal. Chem., 25, 1107 (1953). Mills, J. A., "Correlations Between Monocyclic and Polycyclic Unsaturated Com- pounds from Molecular Rotation Differences," ]. Chem. Soc., 4976 (1952). Moffett, R. H., and Rogers, D., "The Molecular Configuration of Longifolene Hydro- chloride," Chemistry & Industry, 916 (1953). Morrison, F. R., Penfold, A. R., and Simonsen, Sir John, "The Essential Oils of Zieria smithii Andrews and Its Various Forms," ]. Proc. Roy. Soc. New South It•ales, 84, 196 (1950).