  The field equations of the original Kaluza's theory are analyzed and it is
shown that they lead to modification of Einstein's equations. The appearing
extra energy-momentum tensor is studied and an example is given where this
extra energy-momentum tensor is shown to allow four-dimensional Schwarzschild
geometry to accommodate electrostatics. Such deviation from Reissner-Nordstrom
geometry can account for the interpretation of Schwarzschild geometry as
resulting not from mass only, but from the combined effects of mass and
electric charge, even electric charge alone.
