 What convinced Casey to go to Jupiter?
JUPITER'S JOKE By A. L. HALEY Casey Ritter, the guy who never turned down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. [Transcriber's Note: This etext was produced from Planet Stories Fall 1954. Sure, the crystals are deadly, but I was smuggling them legitimately, in a manner of speaking, for this doctor to experiment with. But—and this was the 'but' that was likely to deprive the System of my activities—even experimenting with them was illegal even if it needed to be done; also, I had promised not to rat on him before taking the job. So there I was, closeted with the ten members of the S.S. Customs Court, getting set to hear the gavel fall and the head man intone the sentence that would take me out of circulation for a long, long time. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. Jupiter was a death sentence. "You've no doubt heard tales of the strange population of Jupiter," he said. How could any—" The senior judge rapped ferociously, and I skidded to a halt. We possess well-authenticated photographs of these inhabitants, and if you are prepared to visit them and in some way worm from them the secret of their anti-gravity field, the government stands ready to issue you a full pardon as well as a substantial monetary reward. That whole Kooleen caper: Had it been just a trap to lead me straight to this? Well, a cross between a scorpion and a grasshopper, to be accurate. "I just made a pass at the Killicut Emeralds, that's all, and got nabbed." "What were you trying to do, start a feud between us and Mars?" Big as hen's eggs, an even dozen of 'em; and flawless, I'm a-shoutin', not a flaw!" Those emeralds were in the inner shrine of the super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines. My jaw must've been hanging down a foot, because I'd just been playing along with him, not really believing him, and now all of a sudden I somehow knew that he'd really lifted those emeralds. Damn desert's lousy with 'em, if it wasn't so much trouble to dig 'em out—" He went off into a dream about the rocks on Mars but I jerked him back.
 Pard told him he'd lived through it
 The Government offered additional money  Pard told him about the perfume  He learned that Pard had a friend there  Pard told him he'd lived through it