Abstract: The essential oil of the chinese drug, Hu-Io-po-tze, the seeds of Daucus carota L., was found to contain the following constituents: (1)a small amount of tiglic acid,(2) asarone, and(3) bisabolene which forms a trihydrochloride, melting point 77-78℃ and a hexabromide, melting point 155-157℃. From the non-volatile residue obtained by extracting the drug with benzene there have been isolated, an asaraldehyde, its semicarbazone melts at 205-207℃ and an unknown sterol having a molecule formula C₂₇H₅₂O and a melting point 87℃.