The original plans for this Symposium called for a review of galactic problems by the late Dr. J. L. Pawsey and myself. In the early days of radio astronomy Pawsey often represented CSIRO at international symposia. Many of us enjoyed the lucid reviews that he presented of the work done at CSIRO, much of which was carried out under his inspiring and energetic guidance. It is at a moment such as the present one that we remember him vividly and miss him deeply.