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Published online by Cambridge University Press: 12 April 2016
Prologue: I rise to address you today with sadness in my heart - sadness which I trust is shared by all those here present; for as is underlined by its subtitle, our beloved colleague Vainu Bappu - past President of the International Astronomical Union, and life-long student of the subject of our Colloquium - is no longer in this world to take his rightful place among us; and, therefore, my remarks which follow can be dedicated only to his memory.
Delivered on 3 June, 1983 at the Lembang-Bamberg IAU Colloquium No. 80 on ‘Double Stars: Physical Properties and Generic Relations', held at Bandung, Indonesia.