This11th review of analytical procedures for essential oils and related products covers Paper chromatography was used by Richter and Muscholl (515) to isolate linalool, geraniol, citronellol, and linalyl acetate from oils of lavender, lavandin, geranium, citronella, and melissa. The quantities of the isolates were estimated by colorimetry.Infrared spectroscopy was used by Vega Morales (687) to detect adulterants in the oils of lavender, peppermint, lemon, and orange.The application of ultraviolet spectroscopy was critically studied by Vernin (693). He stressed its importance in the elucidation of molecular structure. The technique was utilized by Koul and Nigam (322) for the quantitative determination of a number of components in various oils.