 Why was Ferris against testing the discovery made by himself and Mitchell on himself?
Our reputations don't go outside our own fields," Mitchell said. "But now Macklin—" Elliot Macklin had inherited the reputation of the late Albert Einstein in the popular mind. No one knew whether his Theory of Spatium was correct or not because no one had yet been able to frame an argument with it. The government took up a lot of his time using him as the symbol of the Ideal Scientist to help recruit Science and Engineering Cadets. For the past seven years Macklin—who was the Advanced Studies Department of Firestone University—had been involved in devising a faster-than-light drive to help the Army reach Pluto and eventually the nearer stars. "He's always treated me like dirt," Ferris said heatedly. "But think," Ferris interjected, "what a boon it would be if everyone could be cured of headaches forever by one simple injection." "Aspirins would still be used to reduce fever and relieve muscular pains," Mitchell said. "There are a number of different causes for headaches—nervous strain, fatigue, physical diseases from kidney complaints to tumors, over-indulgence—but there is one effect of all of this, the one real cause of headaches," Mitchell announced. "The virus," Ferris explained, "can easily be localized and stabilized. Unless we can produce quick, conclusive and dramatic proof of our studies we can get no more financial backing. Ferris and I are confident that there is no danger....
 Because it was unethical.
 Because it was too dangerous.  Because it was unethical.  Because he had a headache.  Because they were underfunded.