Former Alabama Gov. George C. Wallace, chronically ill since a would-be assassin's bullet left him paralyzed 17 years ago, has returned to his university post, his son says. "He is going into the office three or four times a week," State Treasurer George C. Wallace Jr. said. "We are very pleased about his turn for the better." The elder Wallace, 69, was bedridden for several months beginning late last year and seldom left his Montgomery, Ala., home, his son said.