This final report on project DE-AT19-81BC10476 describes vapor pressure studies of the solubilizaEIOn of hydrocarbons and hydrocarbon derivatives by aqueous micellar solutions. An automated vapor pressure apparatus and a manual apparatus incorporating a mercury-covered sintered-glass disk inlet valve were used to obtain highly precise data for the solubilization of hydrocarbons and aliphatic alcohols into aqueous solutions of the ionic surfactants sodium octylsulfate and n-hexadecylpyridinium chloride (cetylpyridinium chloride).