Professor Hanns Juptner has divided the study of chemical engineering into two groups, namely: energy and matter; and beginning with a general discussion of the various forms of energy, has written four volumes covering the subject both theoretically and practically. The present volume deals with heat energy and fuels and contains a large amount of carefully tabulated data in convenient form for use. A great deal of this data is new and will be welcomed by chemists, metallurgists and engineers. Although the book is intended for use in universities and engineering schools it is of equal value to practising engineers, since it gives not only the fundamental principles, but also the latest experimental data and practice. Among the topics of greatest practical interest are: Measurement of high temperatures and late data on the melting points of various substances; discussion of incomplete combustion, combustion temperatures and combustion at constant volume and constant pressure, and an immense amount of data on solid, liquid and gaseous fuels and their production. The chapters on the gasification of fuels, which contain the results of the author's own experiments' as well as those of Strache and Jahoda, are of especial value. The book has been extremely well received in Europe, where it is widely used both in schools and in practice as a textbook and handbook.
