Now the third was Leprince-Ringuet who was, in fact a very important person, not perhaps as a teacher, in the sense that it was just after the war, he had himself not become yet a member of the international community, and his course was, in parts, very old-fashioned, and partly new, it was in transition. But Ringuet was one person who understood that a laboratory had to be established, that experimental physics was something important. There was an extraordinary level of enthusiasm there. For example, I did go to his laboratory; in fact I worked with two people who later became very well known physicists, Muller and Lagarrigue who had the kind of 'Treiman' as they called it, and while Lagarigue stayed in very strongly, Muller also did, I think, even though I saw him less. I left because it was too much and too slow for me, in a certain sense. Actually it was not too difficult because, I must emphasise, I am very good with my hands; I have a steady hand, and so I could actually prepare the instruments by myself. But I felt that I wanted to start science not by just making little instruments for cosmic rays, but- not go so fast into experimental physics.