A naphtha obtained by destructive, recycle hydrogeneation of crude shale oil, produced by gas-combustion retorting of Colorado oil shale, was found by the Bureau of Mines to contain 49.1 percent paraffins, 20.3 percent cycloparaffins, 7.8 percent olefins, and 22.8 percent aromatics. The naphtha contained only minor amounts of sulfur, nitrogen, and oxygen compounds. Compounds containing less than 5 carbon-atoms per molecule were removed by distillation before analysis. The paraffins were predominantly straight-chain compounds; n-Hexane was present in the largest quantity, and the other straight-chain paraffins decreased in amount as the molecular weigh increased. The cycloparaffins, which contained both cyclopentanes and cyclohexanes, were evenly distributed throughout the boiling range. Although the naphtha has been produced by hydrogenation, it contained a small quantity of olefins. Straight-chain olefins with a terminal double bond comprised about two-thirds of these compounds. Among olefins with an internal double bond, those having trans configuration were present in three times the quantity of those in the cis form. In the aromatics all but one of the alkylbenzenes having nine or less carbon-atoms per molecule were identified; toluene was present in the greatest quantity. Only a few o the higher molecular weight homologs were identified.