The chemical composition of the essential oils was determined by the GC-MS analysis. The identification of the unknown compounds was based on their relative retention time and their mass spectra in comparison with those observed by standards. Some compounds were tentatively identified, by using the NBS75K library data of the GC-MS system and literature data (Adams, 2001). The results are presented in Table 1. The compounds are listed according to their elution order which is in agreement with their Kovats Index (KI) on non-polar phases reported in the literature (Adams, 2001). In Table 1 are also reported the oil yields from the