Alan Campbell was once a very good friend of Dorian’s. They had met at a party. Alan was a chemist but he played the piano very well, and his interest in music attracted Dorian. They went to the opera together and Alan thought, like many others, that Dorian was a wonderful man who always did exciting things. Then, one day, they stopped seeing each other. No one knew why, but they noticed that Alan always left the room when Dorian entered. Alan became sad and depressed. He stopped playing music and going to parties, and he spent most of his time alone in his laboratory doing experiments.