Trent, but not quite correct. The fact is, I was seeing the doctor for personal reasons. Just a physical checkup. It had nothing to do with the rocket experiment or the effect of the cosmic rays on the animal we're including in the experiment."

"It was just a thought, doctor," Trent replied, as he moved the coupe out on the open highway away from Tucson and toward the Rocket Proving Grounds on the desert flats in the distance.

"So now that we've disposed of that, what else would you like to know?" Gaddon asked him, a peculiar edge to his voice that Trent did not miss.

"Well, I would like to get a first hand bit of information on just exactly what you plan to prove with this experiment. If I'm correct, Dr. Mathieson, the head of the project, contends that cosmic rays may be lethal, and this experiment is to prove his point."

The physicist snorted. "It is no secret that Mathieson and myself disagree violently on that subject."

Trent's eyebrows raised. "Is that so? I wasn't aware of it?"

Gaddon paused, seeing that his words had slipped out too freely. Finally he said, "What I meant to say, Trent, is that up until now it has not been a public issue of disagreement. And I would prefer to have it remain a private matter until after the experiment."

"I see," Trent mused. "You have my word that I won't print anything you say without your permission. But just what is the difference of opinion between you and Mathieson?"

Gaddon took a long pull at his cigar and waited a few moments before replying. It was apparent to Trent that he was debating continuing the subject with a newspaperman. But Trent had gauged the man correctly. There was a flair of vanity in Gaddon that dated back to his English ancestry. Trent remembered that Gaddon, quite a figure in English scientific circles, had created a stir when he had come over to the United States to assist in rocket research at the Arizona proving grounds. It seemed that Gaddon had not wanted to take a back seat to the famed American scientist, Mathieson. It had made a few gossip columns in the newspapers before Washington put an official clamp on the matter.

Now, as Trent waited for the Englishman to reply, he could almost sense the thoughts that were going through Gaddon's mind. The Englishman was debating whether to take an open stand against the viewpoints of his American colleague. But Trent felt that 

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