The monograph Thermal Methods in Petroleum Analysis is based mainly on results of more than twelve years research work on the application of thernioanalytical methods to petroleum and its products during the activities of the author at the German Institute for Petroleum Research. It was very interesting to research the application of well defined physical methods, such as thermogravimeiry and differential scanning calorimetry, to the multicomponent systems of petroleum and its products, and to understand the limits of those methods on the one hand and the excellent transferability of the results to technical processes on the other. The diversity of possible applications of thernioanalytical methods to various problems in the petroleum laboratory can only be indicated in this monograph.