The only thing that could delay the project was Macklin's health. Despite his impressive body, some years before he had suffered a mild stroke ... or at least a vascular spasm of a cerebral artery. It was known that he suffered from the vilest variety of migraine. A cycle of the headaches had caused him to be absent from his classes for several weeks, and there were an unusual number of military uniforms seen around the campus. * * * * * Ferris paced off the tidy measurements of the office outside the laboratory in the biology building. Mitchell sat slumped in the chair behind the blond imitation wood desk, watching him disinterestedly. "Do you suppose the Great Man will actually show up?" Ferris demanded, pausing in mid-stride. "I imagine he will," Mitchell said. "Macklin's always seemed a decent enough fellow when I've had lunch with him or seen him at the trustees meetings." "He's always treated me like dirt," Ferris said heatedly. "Everyone on this campus treats biologists like dirt. Sometimes I want to bash in their smug faces." Sometimes, Mitchell reflected, Ferris displayed a certain lack of scientific detachment. There came a discreet knock on the door. "Please come in," Mitchell said. Elliot Macklin entered in a cloud of pipe smoke and a tweed jacket. He looked more than a little like a postgraduate student, and Mitchell suspected that that was his intention. He shook hands warmly with Mitchell. "Good of you to ask me over, Steven." Macklin threw a big arm across Ferris' shoulders. "How have you been, Harold?" Ferris' face flickered between pink and white. "Fine, thank you, doctor." Macklin dropped on the edge of the desk and adjusted his pipe. "Now what's this about you wanting my help on something? And please keep the explanation simple. Biology isn't my field, you know." Mitchell moved around the desk casually. "Actually, Doctor, we haven't the right to ask this of a man of your importance. There may be an element of risk." The mathematician clamped onto his pipe and showed his teeth. "Now you have me intrigued. What is it all about?" "Doctor, we understand you have severe headaches," Mitchell said. Macklin nodded. "That's right, Steven. Migraine." "That must be terrible," Ferris said. "All your fine reputation and lavish salary can't be much consolation when that ripping, tearing agony begins, can it?" "No, Harold, it isn't," Macklin admitted. "What does your project have to do with my headaches?" "Doctor," Mitchell said, "what would you say the most common complaint of man is?" "I would have said the common cold," Macklin replied, "but I suppose from what you have said you mean headaches." * * * * * "Headaches," Mitchell agreed. "Everybody has them at some time in his life. Some people have them every day. Some are driven to suicide by their headaches." "Yes," Macklin said.