"Among the nonhydrocarbon constituents of shale-oil naphtha are various classes of nitrogen- and oxygen- containing compounds. These are important because of their effect on processing techniques and because of by- product possibilities. Bureau of Mines work on naphtha from Colorado shale oil as reported in this paper has resulted in the identification of eleven phenols, twelve pyridines, two pyrroles, three benzonitriles, and benzofuran. Relative amounts of individual phenols and pyridines were estimated and evidence indicating the presence in of carboxylic acids was obtained. Previously, two additional pyrroles and two quinolines were reported by the Bureau. Other investigators have found phenols, ketones, an alcohol and an ether among the oxygen compounds and pyridines among the nitrogen compounds in shale oil. As the result of this work two new classes of compounds for which no individual member had previously been reported were shown to be present in shale-oil naphtha."