In the first chapter of my book, entitled "A Unified Field Theory", it is proved that such a theory is feasible for a material point and an electric charge point, on wich no external physical fields are acting. In the second chapter of the book, entitled "Transition of the Vacuum into Matter", it is postulated that there is a physical link between the gravitational and the resultant electromagnetic field that is in force, both in the macro-universe and, in a different kind, in the micro-universe.