The book of the famous French theoretical physicist Abraham, offered to the attention of the Soviet reader, is a fundamental monograph specifically devoted to outlining the foundations of the theory of nuclear magnetic resonance, quadrupolar resonance and nuclear relaxation in solids and liquids. The book consistently, from a single point of view, describes theoretical methods for describing the dynamics of the behavior of macroscopic systems of nuclear moments in condensed matter, and at the same time reflects almost all the issues related to this, studied to date.