The best developed of today's kinetic theories are those for gases and completely ionized plasmas. In recent years, however, kinetic theories of more complicated systems - consisting of free particles as well as those bound in atoms, and an electromagnetic field - have played an increasingly important role. An example of such a system is a partially ionized plasma of gas discharges or in semicon- ductors. The main purpose of this book is the further development of the kinetic theory of systems of this kind. Naturally, it would be impossible to encompass at once all the problems con- cerning...