James Rendell had been his research student. They had- they'd been doing experimental speciation with Drosophila in cages, and Jim, of course, was taken up in the war effort, and at that time he was working for Waddington in Coastal Command, and they were doing what used to be- what was then called Operational Research, that was the fashionable term. Jim said, well, what their achievement was building a schedule of flying Hudson reconnaissance airplanes over the North Atlantic, which would optimally catch U-boats. I think they had a bomb or two with them too for hitting the U-boats. So I- Although Jim was in Operational Research for the war, I used to trundle out to his house in Pinner, which was a long way in those days on the Underground, and he would tell me about the wonderful world of genetics and about genetics. And by the time I left, I knew more genetics, I'm sure, than anybody except one or two specialists in Oxford.