cussion until his health improved. In the summer, when we talked to him about the meeting, he basically approved of the idea but immediately sug­ gested our turning it into a proper scientific congress, rather than limiting ourselves to inviting his friends and former co-workers. He had very good friends in many parts of the world and would certainly have liked to see many of them again. However, his interest in science remained the domi­ nant factor. He proposed the main topics for the conference and suggested several speakers to be invited. Although he knew that his health was crit­ ical and that his condition could rapidly worsen, we had the feeling that the planning gave him hope and perhaps an opportunity to look forward.