The Fundamental Constants of Atomic Physics.- I. Introduction.- II. History of our knowledge of the atomic constants.- III. Least squares adjustment of the atomic constants.- Addendum.- References.- Quantum Mechanics of One- and Two-Electron Systems.- I. The hydrogen atom without external fields.- II. The helium atom without external fields.- III. Atoms in external fields.- IV. Interaction with radiation.- Sachregister (Deutsch-Englisch).- Subject Index (English-German).