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To unravel the secrets Nature has locked up in petroleum, to probe at the heart of its composition, and to lay open-as on the operating table-the components in a way which accurately discloses their identity, API Research Project 6 has had this one well-selected representative petroleum under exhaustive examination continuously since 1928. To learn how different petroleums vary in composition, the project some years ago completed a long, but less exhaustive, analysis of the hydrocarbons in the gasoline fraction of seven different, carefully selected, representative petroleums. These latter data permit translating the extensive results obtained on the project's one representative petroleum to other petroleums on which only a few key points of data need be known or obtained. The exhaustive fraction-ation, although very costly, fortunately needs doing only once, and is of such a fundamental nature as to be particularly well suited to cooperative action by the entire industry.A detailed description of the petroleum under investigation and the fractionating processes used is given by Rossini, Mair, and Streiff (1). A complete list of the publications of API Research Project 6 is obtainable on request. LITERATURE CITED (

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