Proceedings of an International Conference to Celebrate the Centenary of the Royal Observatory, Edinburgh, Held at the Edinburgh Conference Centre, Heriot-Watt University, Riccarton, Edinburgh, Scotland 29 August - 2 September 1994

The papers in this study cover a range of scenarios, from disk and envelope around young stellar objects and protostars through to more aged stars and highly-evolved objects which exhibit considerable mass loss features. Significant advances and developments in observing facilities, instrumentation, computing power and techniques are described, together with a variety of theories, suggestions, observations and models. The formation, composition, effects and evolution of the material surrounding a stellar environment are also included.