 The fever that sets on a man. Makes him want to find gold more than anything. That kind of fever can get you killed, mister. Yes, sir. I bet it can. Well, don't you worry yourself about me, Captain. Me and this little wagon train are staying right smack on the Oregon Trail. Good. Oh, I'd watch my stock if I were you. There's alkali in these streams through here. Won't kill them, but too much will make them sick. I'll keep an eye on them. Well...