Reviews in Modern Astronomy : Springer : 9783642775451 : 3642775454 : 21 Dec 2011 : The International Scientific Spring Meeting of the Astronomische Ge­ sellschaft (AG) held at Bamberg in April 1991 was devoted to "Vari­ abilities in Stars and Galaxies". Time-dependent phenomena are observed in a wide range of as­ tronomical objects. They are caused by different physical mechanisms (for example by pulsation, by accretion, or by dramatic eruptive events in connection with mass outflow) producing observable intensity vari­ ations through all wavelengths. Many of the papers in this volume are concerned with galactic stars showing such behaviour (for ex­ ample cataclysmic variables, symbiotic stars, luminous blue variables (LBVs) and novae). Intrinsic variations of the, magnetic field struc­ ture on observable time scales are, for instance, a peculiarity of cool, solar-like stars and represent a useful tool to study differential rotation and cycles of activity. Recent results on the invest