  In the present work foundations of the law of the energy conservation and the
introduction of particles in the classical electrodynamics are discussed. We
pay attention to a logic error which takes place at an interpretation of the
Poynting's theorem as the law of conservation of energy. It was shown that the
laws of conservation of energy and momentum of the system of electromagnetic
fields and charged particles does not follow from the equations of
electrodynamics and the violation of these laws is displayed at the energy
change of particles. Particular examples are considered which make it possible
to restrict a possible kind of fields of a non-electromagnetic origin. We hope
that this work will permit to produce a more comprehensive analysis and to
stimulate the next step to the development of the foundations of the classical
and quantum electrodynamics.
