The book is a kind of encyclopedia on inorganic chemistry, equally interesting and useful for both a novice and an experienced chemist. The course of inorganic chemistry is presented on the basis of new ideas about the structure of matter. The basis of the system of arrangement of the material and the entire construction of the course is the periodic law in its modern lighting. The description of elements and their compounds is harmoniously and strictly scientifically systematized. Much attention is paid to the crystal chemical interpretation of the properties of various inorganic substances.