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Published online by Cambridge University Press: 14 August 2015
It is a great honour and pleasure for me to welcome, at the opening of the last session of this Symposium, the presence among us of Prof. Oort, Retiring President of I. A. U. I would like to thank him for his interest in the problems we are dealing with, and I am confident that our discussions to day will enable him to tell the Executive Committee of the Union that we have usefully spent our time here.