colonists!"

Rockingham Roswell coughed gently. The young savant was taller than any man present, and but for the conservative cut of his clothing might have looked his true weight, but he carried himself in such a way as to seem more fragile than he really was. His lean, close-shaven cheeks were pale, and his tow-colored hair was meticulously plastered to his scalp. He wore thick-lensed, tortoise-shell glasses which he removed and polished nervously as he spoke.

"In ... er ... in that case, Mister Grossman, it strikes me as a bit odd that you should ... er ... have established business headquarters on the satellite."

Grossman glanced sharply at the slender man, snapped impatiently, "A business man cannot always pick and choose his locations, Doctor Roswell. He must follow the path of empire as it leads. Since there are Earthmen on Titan, someone must serve them. It is an obligation which cannot be refused—"

"Er ... quite!" acknowledged Roswell confusedly. "Job of work to be done ... noble noble sacrifice ... the white man's burden ... all that sort of rot ... what?"

Unaccountably, Grossman flushed. "If you are trying to imply, sir," he fumed, "that I have any ulterior motive in establishing a trading post on Titan—"

"Oh, gracious, no! Nothing of the sort. I wouldn't presume to question your ... er ... business acumen, Factor. I'm hardly the type, what?" Roswell smiled a faint, thin, apologetic smile. "I mean I ... er ... I really don't know much about this sort of thing ... if you know what I mean...."

Captain Burke stared at the younger man impatiently. A spaceman toughened in the crucible of action, he had little patience with such learned young fops as this passenger. His words were polite, as befitted the skipper of a luxury liner, but his tone was brushed with acid.

"If you don't mind, Doctor Roswell, Factor Grossman was about to tell us something about the hazards of Titan. Well, Mister Grossman?"

Grossman took another appreciative sip of his brandy, set down the tulip-glass, and steepled his fingers.

"Well, the perils of Titan fall into several classes. Geographic, physiological and racial. In the first place, it is a satellite approximately the size of Earth's moon ... large enough to sustain life, but small enough to be influenced by the perturbations not only of its 

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