G.C.M.S. studies showed that the pet.ether soluble fraction of Cedrus deodara bark has a large number of hydrocarbons. This paper describes the isolation and identification of saturated straight and branched chain hydrocarbons ranging C-14 - C20 and unsaturated sesquiterpene hydrocarbons with empirical formula C15H24. Four isomers of himachalene have been found. A new isomer with double bonds in a conjugated position 4 and 10, not reported before has been identified by its I.R, U.V., N.M.R. and mass spectra.

S. NAHEED ,naeema khan ,