Proceedings of IAU Symposium No. 100, held in Besan?on, France, August 9-13, 1982I. Kinematics of Gas and the Undunderlying Mass Distribution.- Systematics of HII Rotation Curves.- HI Velocity Fields and Rotation Curves.- A High Resolution HI Survey of M31.- High Velocity HI in the Inner 5 KPC of M31.- Comparison of Global 21 cm Velocity Profiles with H?, Rotation Curves.- TAURUS A Wide Field Imaging Fabry-Perot Spectrometer.- HI Observations of the Irregular Galaxy IC 10.- The Distribution of Molecular Clouds in Spiral Galaxies.- The CO Rotation Curve of the Milky Way : Accuracy and Implications.- Cold Molecular Material in the Galaxy.- Molecular Clouds in the Galactic Nucleus.- Molecular Clouds in Spiral Galaxies.- CO Observations of M51.- Gas at Large Radii.- Rotation Curve and Mass Model for the Edge-on Galaxy NGC 5907.- Optical Features Associated with the Extended HI Enveloppe of M83.- M82 Tilt and Warp of its Principal Plane.- Vertical Motion and the Thickness of HI Disks Implications For Galactic Mass Models.- Do Spiral Galaxies Have a Variable Disk Thickness?.- Mass Distribution and Dark Halos.- The Origin of Dwarf Spheroidal Galaxies.- NGC 3992 A Galaxy Without a Massive Halo.- Groups of Galaxies and the Missing Mass Problem.- HI Observations of the Interacting Galaxies VV 371 and VV 329.- Distribution and Motions of Atomic Hydrogen in Lenticular Galaxies.- Neutral Hydrogen Mapping of three SO Galaxies.- II. Spiral Structure.- Theory of Spiral Structure.- Quasi-Stationary Spiral Structure in Galaxies.- Dynamical Mechanisms for Discrete Unstable Spiral Modes in Galaxies.- Global Instabilities of a Galaxy Model.- Global Stability Analysis of an SO Galaxy NGC 3115.- Spiral Instabilities and Disk Heating.- On the Evolution of Perturbed Gas Disks.- Cloud-Particle Dynamics and Star Formation in Spiral Galaxies.- The Ballistic Particle Model.- Relation Between Star Formation and Angular Momentum in Spiral Galaxies.- Model Calculations on the Large Scale lók